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Finding the Fourth Proportional to 136,890.96, 205,356.15 and 42,129.20

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Solution

The fourth proportional to 136,890.96, 205,356.15 and 42,129.20 is: 63,199.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,890.96 : 205,356.15 = 42,129.20 : x
  2. Step 2: Convert to fraction form
    136,890.96/205,356.15 = 42,129.20/x
  3. Step 3: Cross multiply
    136,890.96x = 205,356.15 × 42,129.20
  4. Step 4: Simplify right side
    136,890.96x = 8,651,489,287.80
  5. Step 5: Solve for x
    x = 8,651,489,287.80/136,890.96
  6. Step 6: Final answer
    x = 63,199.86

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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.