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Finding the Fourth Proportional to 129,977.16, 179,380.44 and 78,978.04

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Solution

The fourth proportional to 129,977.16, 179,380.44 and 78,978.04 is: 108,996.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,977.16 : 179,380.44 = 78,978.04 : x
  2. Step 2: Convert to fraction form
    129,977.16/179,380.44 = 78,978.04/x
  3. Step 3: Cross multiply
    129,977.16x = 179,380.44 × 78,978.04
  4. Step 4: Simplify right side
    129,977.16x = 14,167,115,565.54
  5. Step 5: Solve for x
    x = 14,167,115,565.54/129,977.16
  6. Step 6: Final answer
    x = 108,996.96

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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.