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Finding the Fourth Proportional to 85,959.97, 129,013.76 and 48,556.78

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Solution

The fourth proportional to 85,959.97, 129,013.76 and 48,556.78 is: 72,876.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,959.97 : 129,013.76 = 48,556.78 : x
  2. Step 2: Convert to fraction form
    85,959.97/129,013.76 = 48,556.78/x
  3. Step 3: Cross multiply
    85,959.97x = 129,013.76 × 48,556.78
  4. Step 4: Simplify right side
    85,959.97x = 6,264,492,761.29
  5. Step 5: Solve for x
    x = 6,264,492,761.29/85,959.97
  6. Step 6: Final answer
    x = 72,876.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.