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Finding the Fourth Proportional to 129,765.42, 179,076.42 and 76,039.74

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Solution

The fourth proportional to 129,765.42, 179,076.42 and 76,039.74 is: 104,934.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,765.42 : 179,076.42 = 76,039.74 : x
  2. Step 2: Convert to fraction form
    129,765.42/179,076.42 = 76,039.74/x
  3. Step 3: Cross multiply
    129,765.42x = 179,076.42 × 76,039.74
  4. Step 4: Simplify right side
    129,765.42x = 13,616,924,416.93
  5. Step 5: Solve for x
    x = 13,616,924,416.93/129,765.42
  6. Step 6: Final answer
    x = 104,934.92

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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.