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Finding the Fourth Proportional to 85,738.60, 128,607.90 and 54,245.80

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Solution

The fourth proportional to 85,738.60, 128,607.90 and 54,245.80 is: 81,368.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,738.60 : 128,607.90 = 54,245.80 : x
  2. Step 2: Convert to fraction form
    85,738.60/128,607.90 = 54,245.80/x
  3. Step 3: Cross multiply
    85,738.60x = 128,607.90 × 54,245.80
  4. Step 4: Simplify right side
    85,738.60x = 6,976,438,421.82
  5. Step 5: Solve for x
    x = 6,976,438,421.82/85,738.60
  6. Step 6: Final answer
    x = 81,368.70

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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.