Home / 128,721.79-177,646.56-71,379.10

Finding the Fourth Proportional to 128,721.79, 177,646.56 and 71,379.10

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Solution

The fourth proportional to 128,721.79, 177,646.56 and 71,379.10 is: 98,508.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,721.79 : 177,646.56 = 71,379.10 : x
  2. Step 2: Convert to fraction form
    128,721.79/177,646.56 = 71,379.10/x
  3. Step 3: Cross multiply
    128,721.79x = 177,646.56 × 71,379.10
  4. Step 4: Simplify right side
    128,721.79x = 12,680,251,040.73
  5. Step 5: Solve for x
    x = 12,680,251,040.73/128,721.79
  6. Step 6: Final answer
    x = 98,508.97

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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.