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Finding the Fourth Proportional to 121,242.30, 181,863.45 and 79,251.90

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Solution

The fourth proportional to 121,242.30, 181,863.45 and 79,251.90 is: 118,877.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,242.30 : 181,863.45 = 79,251.90 : x
  2. Step 2: Convert to fraction form
    121,242.30/181,863.45 = 79,251.90/x
  3. Step 3: Cross multiply
    121,242.30x = 181,863.45 × 79,251.90
  4. Step 4: Simplify right side
    121,242.30x = 14,413,023,953.06
  5. Step 5: Solve for x
    x = 14,413,023,953.06/121,242.30
  6. Step 6: Final answer
    x = 118,877.85

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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.