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Finding the Fourth Proportional to 1,654.38, 2,481.57 and 421.89

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Solution

The fourth proportional to 1,654.38, 2,481.57 and 421.89 is: 632.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,654.38 : 2,481.57 = 421.89 : x
  2. Step 2: Convert to fraction form
    1,654.38/2,481.57 = 421.89/x
  3. Step 3: Cross multiply
    1,654.38x = 2,481.57 × 421.89
  4. Step 4: Simplify right side
    1,654.38x = 1,046,949.57
  5. Step 5: Solve for x
    x = 1,046,949.57/1,654.38
  6. Step 6: Final answer
    x = 632.84

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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.