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Finding the Fourth Proportional to 121,203.90, 181,805.85 and 89,711.10

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Solution

The fourth proportional to 121,203.90, 181,805.85 and 89,711.10 is: 134,566.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,203.90 : 181,805.85 = 89,711.10 : x
  2. Step 2: Convert to fraction form
    121,203.90/181,805.85 = 89,711.10/x
  3. Step 3: Cross multiply
    121,203.90x = 181,805.85 × 89,711.10
  4. Step 4: Simplify right side
    121,203.90x = 16,310,002,789.94
  5. Step 5: Solve for x
    x = 16,310,002,789.94/121,203.90
  6. Step 6: Final answer
    x = 134,566.65

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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.