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Finding the Fourth Proportional to 121,128.60, 181,800.90 and 71,146.20

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Solution

The fourth proportional to 121,128.60, 181,800.90 and 71,146.20 is: 106,782.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,128.60 : 181,800.90 = 71,146.20 : x
  2. Step 2: Convert to fraction form
    121,128.60/181,800.90 = 71,146.20/x
  3. Step 3: Cross multiply
    121,128.60x = 181,800.90 × 71,146.20
  4. Step 4: Simplify right side
    121,128.60x = 12,934,443,191.58
  5. Step 5: Solve for x
    x = 12,934,443,191.58/121,128.60
  6. Step 6: Final answer
    x = 106,782.73

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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.