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Finding the Fourth Proportional to 121,418.10, 182,127.15 and 85,988.70

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Solution

The fourth proportional to 121,418.10, 182,127.15 and 85,988.70 is: 128,983.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,418.10 : 182,127.15 = 85,988.70 : x
  2. Step 2: Convert to fraction form
    121,418.10/182,127.15 = 85,988.70/x
  3. Step 3: Cross multiply
    121,418.10x = 182,127.15 × 85,988.70
  4. Step 4: Simplify right side
    121,418.10x = 15,660,876,863.21
  5. Step 5: Solve for x
    x = 15,660,876,863.21/121,418.10
  6. Step 6: Final answer
    x = 128,983.05

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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.