Home / 142,387.20-196,495.56-78,727.68

Finding the Fourth Proportional to 142,387.20, 196,495.56 and 78,727.68

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Solution

The fourth proportional to 142,387.20, 196,495.56 and 78,727.68 is: 108,644.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,387.20 : 196,495.56 = 78,727.68 : x
  2. Step 2: Convert to fraction form
    142,387.20/196,495.56 = 78,727.68/x
  3. Step 3: Cross multiply
    142,387.20x = 196,495.56 × 78,727.68
  4. Step 4: Simplify right side
    142,387.20x = 15,469,639,569.10
  5. Step 5: Solve for x
    x = 15,469,639,569.10/142,387.20
  6. Step 6: Final answer
    x = 108,644.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.