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Finding the Fourth Proportional to 129,686.31, 179,011.76 and 75,988.71

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Solution

The fourth proportional to 129,686.31, 179,011.76 and 75,988.71 is: 104,890.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,686.31 : 179,011.76 = 75,988.71 : x
  2. Step 2: Convert to fraction form
    129,686.31/179,011.76 = 75,988.71/x
  3. Step 3: Cross multiply
    129,686.31x = 179,011.76 × 75,988.71
  4. Step 4: Simplify right side
    129,686.31x = 13,602,872,337.29
  5. Step 5: Solve for x
    x = 13,602,872,337.29/129,686.31
  6. Step 6: Final answer
    x = 104,890.58

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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.