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Finding the Fourth Proportional to 57,720.60, 86,597.10 and 28,139.40

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Solution

The fourth proportional to 57,720.60, 86,597.10 and 28,139.40 is: 42,217.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,720.60 : 86,597.10 = 28,139.40 : x
  2. Step 2: Convert to fraction form
    57,720.60/86,597.10 = 28,139.40/x
  3. Step 3: Cross multiply
    57,720.60x = 86,597.10 × 28,139.40
  4. Step 4: Simplify right side
    57,720.60x = 2,436,790,435.74
  5. Step 5: Solve for x
    x = 2,436,790,435.74/57,720.60
  6. Step 6: Final answer
    x = 42,217.00

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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.