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Finding the Fourth Proportional to 85,408,879.80, 128,113,319.70 and 39,350,659.80

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Solution

The fourth proportional to 85,408,879.80, 128,113,319.70 and 39,350,659.80 is: 59,025,989.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,408,879.80 : 128,113,319.70 = 39,350,659.80 : x
  2. Step 2: Convert to fraction form
    85,408,879.80/128,113,319.70 = 39,350,659.80/x
  3. Step 3: Cross multiply
    85,408,879.80x = 128,113,319.70 × 39,350,659.80
  4. Step 4: Simplify right side
    85,408,879.80x = 5,041,343,659,363,338
  5. Step 5: Solve for x
    x = 5,041,343,659,363,338/85,408,879.80
  6. Step 6: Final answer
    x = 59,025,989.70

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.