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Finding the Fourth Proportional to 128,779.29, 177,712.11 and 71,418.87

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Solution

The fourth proportional to 128,779.29, 177,712.11 and 71,418.87 is: 98,556.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,779.29 : 177,712.11 = 71,418.87 : x
  2. Step 2: Convert to fraction form
    128,779.29/177,712.11 = 71,418.87/x
  3. Step 3: Cross multiply
    128,779.29x = 177,712.11 × 71,418.87
  4. Step 4: Simplify right side
    128,779.29x = 12,691,998,081.52
  5. Step 5: Solve for x
    x = 12,691,998,081.52/128,779.29
  6. Step 6: Final answer
    x = 98,556.20

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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.