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Finding the Fourth Proportional to 129,959.57, 179,356.28 and 78,960.56

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Solution

The fourth proportional to 129,959.57, 179,356.28 and 78,960.56 is: 108,972.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,959.57 : 179,356.28 = 78,960.56 : x
  2. Step 2: Convert to fraction form
    129,959.57/179,356.28 = 78,960.56/x
  3. Step 3: Cross multiply
    129,959.57x = 179,356.28 × 78,960.56
  4. Step 4: Simplify right side
    129,959.57x = 14,162,071,016.73
  5. Step 5: Solve for x
    x = 14,162,071,016.73/129,959.57
  6. Step 6: Final answer
    x = 108,972.90

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1.5x scale

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.