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Finding the Fourth Proportional to 129,359.76, 178,514.64 and 72,771

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Solution

The fourth proportional to 129,359.76, 178,514.64 and 72,771 is: 100,422.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,359.76 : 178,514.64 = 72,771 : x
  2. Step 2: Convert to fraction form
    129,359.76/178,514.64 = 72,771/x
  3. Step 3: Cross multiply
    129,359.76x = 178,514.64 × 72,771
  4. Step 4: Simplify right side
    129,359.76x = 12,990,688,867.44
  5. Step 5: Solve for x
    x = 12,990,688,867.44/129,359.76
  6. Step 6: Final answer
    x = 100,422.95

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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.