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Finding the Fourth Proportional to 129,873.65, 179,223.89 and 72,513.86

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Solution

The fourth proportional to 129,873.65, 179,223.89 and 72,513.86 is: 100,068.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,873.65 : 179,223.89 = 72,513.86 : x
  2. Step 2: Convert to fraction form
    129,873.65/179,223.89 = 72,513.86/x
  3. Step 3: Cross multiply
    129,873.65x = 179,223.89 × 72,513.86
  4. Step 4: Simplify right side
    129,873.65x = 12,996,214,854.75
  5. Step 5: Solve for x
    x = 12,996,214,854.75/129,873.65
  6. Step 6: Final answer
    x = 100,068.14

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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.