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Finding the Fourth Proportional to 57,710.10, 86,581.35 and 28,128.90

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Solution

The fourth proportional to 57,710.10, 86,581.35 and 28,128.90 is: 42,201.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,710.10 : 86,581.35 = 28,128.90 : x
  2. Step 2: Convert to fraction form
    57,710.10/86,581.35 = 28,128.90/x
  3. Step 3: Cross multiply
    57,710.10x = 86,581.35 × 28,128.90
  4. Step 4: Simplify right side
    57,710.10x = 2,435,438,136.02
  5. Step 5: Solve for x
    x = 2,435,438,136.02/57,710.10
  6. Step 6: Final answer
    x = 42,201.25

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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.