Home / 129,881.40-179,234.61-72,521.70

Finding the Fourth Proportional to 129,881.40, 179,234.61 and 72,521.70

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Solution

The fourth proportional to 129,881.40, 179,234.61 and 72,521.70 is: 100,078.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,881.40 : 179,234.61 = 72,521.70 : x
  2. Step 2: Convert to fraction form
    129,881.40/179,234.61 = 72,521.70/x
  3. Step 3: Cross multiply
    129,881.40x = 179,234.61 × 72,521.70
  4. Step 4: Simplify right side
    129,881.40x = 12,998,398,616.04
  5. Step 5: Solve for x
    x = 12,998,398,616.04/129,881.40
  6. Step 6: Final answer
    x = 100,078.98

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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.