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Finding the Fourth Proportional to 142,439.60, 213,377.80 and 124,929.20

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Solution

The fourth proportional to 142,439.60, 213,377.80 and 124,929.20 is: 187,146.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,439.60 : 213,377.80 = 124,929.20 : x
  2. Step 2: Convert to fraction form
    142,439.60/213,377.80 = 124,929.20/x
  3. Step 3: Cross multiply
    142,439.60x = 213,377.80 × 124,929.20
  4. Step 4: Simplify right side
    142,439.60x = 26,657,117,851.76
  5. Step 5: Solve for x
    x = 26,657,117,851.76/142,439.60
  6. Step 6: Final answer
    x = 187,146.82

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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.