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Finding the Fourth Proportional to 85,862.89, 128,168.92 and 79,531.24

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Solution

The fourth proportional to 85,862.89, 128,168.92 and 79,531.24 is: 118,717.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,862.89 : 128,168.92 = 79,531.24 : x
  2. Step 2: Convert to fraction form
    85,862.89/128,168.92 = 79,531.24/x
  3. Step 3: Cross multiply
    85,862.89x = 128,168.92 × 79,531.24
  4. Step 4: Simplify right side
    85,862.89x = 10,193,432,098.56
  5. Step 5: Solve for x
    x = 10,193,432,098.56/85,862.89
  6. Step 6: Final answer
    x = 118,717.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.