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Finding the Fourth Proportional to 218,488.80, 301,515.04 and 121,691.88

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Solution

The fourth proportional to 218,488.80, 301,515.04 and 121,691.88 is: 167,935.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,488.80 : 301,515.04 = 121,691.88 : x
  2. Step 2: Convert to fraction form
    218,488.80/301,515.04 = 121,691.88/x
  3. Step 3: Cross multiply
    218,488.80x = 301,515.04 × 121,691.88
  4. Step 4: Simplify right side
    218,488.80x = 36,691,932,217.99
  5. Step 5: Solve for x
    x = 36,691,932,217.99/218,488.80
  6. Step 6: Final answer
    x = 167,935.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.