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Finding the Fourth Proportional to 57,680.60, 86,520.90 and 42,918.35

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Solution

The fourth proportional to 57,680.60, 86,520.90 and 42,918.35 is: 64,377.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,680.60 : 86,520.90 = 42,918.35 : x
  2. Step 2: Convert to fraction form
    57,680.60/86,520.90 = 42,918.35/x
  3. Step 3: Cross multiply
    57,680.60x = 86,520.90 × 42,918.35
  4. Step 4: Simplify right side
    57,680.60x = 3,713,334,268.52
  5. Step 5: Solve for x
    x = 3,713,334,268.52/57,680.60
  6. Step 6: Final answer
    x = 64,377.53

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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.