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Finding the Fourth Proportional to 129,765.78, 179,089.34 and 78,766.79

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Solution

The fourth proportional to 129,765.78, 179,089.34 and 78,766.79 is: 108,705.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,765.78 : 179,089.34 = 78,766.79 : x
  2. Step 2: Convert to fraction form
    129,765.78/179,089.34 = 78,766.79/x
  3. Step 3: Cross multiply
    129,765.78x = 179,089.34 × 78,766.79
  4. Step 4: Simplify right side
    129,765.78x = 14,106,291,145.74
  5. Step 5: Solve for x
    x = 14,106,291,145.74/129,765.78
  6. Step 6: Final answer
    x = 108,705.79

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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.