Home / 129,309.78-178,446.33-72,721.56

Finding the Fourth Proportional to 129,309.78, 178,446.33 and 72,721.56

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Solution

The fourth proportional to 129,309.78, 178,446.33 and 72,721.56 is: 100,355.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,309.78 : 178,446.33 = 72,721.56 : x
  2. Step 2: Convert to fraction form
    129,309.78/178,446.33 = 72,721.56/x
  3. Step 3: Cross multiply
    129,309.78x = 178,446.33 × 72,721.56
  4. Step 4: Simplify right side
    129,309.78x = 12,976,895,493.87
  5. Step 5: Solve for x
    x = 12,976,895,493.87/129,309.78
  6. Step 6: Final answer
    x = 100,355.10

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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.