Home / 129,428.76-178,582.14-72,819.48

Finding the Fourth Proportional to 129,428.76, 178,582.14 and 72,819.48

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Solution

The fourth proportional to 129,428.76, 178,582.14 and 72,819.48 is: 100,474.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,428.76 : 178,582.14 = 72,819.48 : x
  2. Step 2: Convert to fraction form
    129,428.76/178,582.14 = 72,819.48/x
  3. Step 3: Cross multiply
    129,428.76x = 178,582.14 × 72,819.48
  4. Step 4: Simplify right side
    129,428.76x = 13,004,258,572.09
  5. Step 5: Solve for x
    x = 13,004,258,572.09/129,428.76
  6. Step 6: Final answer
    x = 100,474.26

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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.