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Finding the Fourth Proportional to 129,379.64, 178,553 and 72,023.52

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Solution

The fourth proportional to 129,379.64, 178,553 and 72,023.52 is: 99,397.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,379.64 : 178,553 = 72,023.52 : x
  2. Step 2: Convert to fraction form
    129,379.64/178,553 = 72,023.52/x
  3. Step 3: Cross multiply
    129,379.64x = 178,553 × 72,023.52
  4. Step 4: Simplify right side
    129,379.64x = 12,860,015,566.56
  5. Step 5: Solve for x
    x = 12,860,015,566.56/129,379.64
  6. Step 6: Final answer
    x = 99,397.52

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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.