Home / 128,279.79-177,026.39-71,691.17

Finding the Fourth Proportional to 128,279.79, 177,026.39 and 71,691.17

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Solution

The fourth proportional to 128,279.79, 177,026.39 and 71,691.17 is: 98,933.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,279.79 : 177,026.39 = 71,691.17 : x
  2. Step 2: Convert to fraction form
    128,279.79/177,026.39 = 71,691.17/x
  3. Step 3: Cross multiply
    128,279.79x = 177,026.39 × 71,691.17
  4. Step 4: Simplify right side
    128,279.79x = 12,691,229,019.98
  5. Step 5: Solve for x
    x = 12,691,229,019.98/128,279.79
  6. Step 6: Final answer
    x = 98,933.97

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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.