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Finding the Fourth Proportional to 129,870, 179,223.37 and 71,726.45

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Solution

The fourth proportional to 129,870, 179,223.37 and 71,726.45 is: 98,984.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,870 : 179,223.37 = 71,726.45 : x
  2. Step 2: Convert to fraction form
    129,870/179,223.37 = 71,726.45/x
  3. Step 3: Cross multiply
    129,870x = 179,223.37 × 71,726.45
  4. Step 4: Simplify right side
    129,870x = 12,855,055,011.70
  5. Step 5: Solve for x
    x = 12,855,055,011.70/129,870
  6. Step 6: Final answer
    x = 98,984.02

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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.