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Finding the Fourth Proportional to 61,418.60, 91,909.20 and 42,610.40

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Solution

The fourth proportional to 61,418.60, 91,909.20 and 42,610.40 is: 63,763.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,418.60 : 91,909.20 = 42,610.40 : x
  2. Step 2: Convert to fraction form
    61,418.60/91,909.20 = 42,610.40/x
  3. Step 3: Cross multiply
    61,418.60x = 91,909.20 × 42,610.40
  4. Step 4: Simplify right side
    61,418.60x = 3,916,287,775.68
  5. Step 5: Solve for x
    x = 3,916,287,775.68/61,418.60
  6. Step 6: Final answer
    x = 63,763.87

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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.