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Finding the Fourth Proportional to 129,765.80, 179,089.32 and 78,766.77

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Solution

The fourth proportional to 129,765.80, 179,089.32 and 78,766.77 is: 108,705.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,765.80 : 179,089.32 = 78,766.77 : x
  2. Step 2: Convert to fraction form
    129,765.80/179,089.32 = 78,766.77/x
  3. Step 3: Cross multiply
    129,765.80x = 179,089.32 × 78,766.77
  4. Step 4: Simplify right side
    129,765.80x = 14,106,287,277.90
  5. Step 5: Solve for x
    x = 14,106,287,277.90/129,765.80
  6. Step 6: Final answer
    x = 108,705.74

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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.