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Finding the Fourth Proportional to 85,984.80, 128,977.20 and 39,328.80

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Solution

The fourth proportional to 85,984.80, 128,977.20 and 39,328.80 is: 58,993.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,984.80 : 128,977.20 = 39,328.80 : x
  2. Step 2: Convert to fraction form
    85,984.80/128,977.20 = 39,328.80/x
  3. Step 3: Cross multiply
    85,984.80x = 128,977.20 × 39,328.80
  4. Step 4: Simplify right side
    85,984.80x = 5,072,518,503.36
  5. Step 5: Solve for x
    x = 5,072,518,503.36/85,984.80
  6. Step 6: Final answer
    x = 58,993.20

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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.