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Finding the Fourth Proportional to 2,654.18, 3,981.28 and 805.31

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Solution

The fourth proportional to 2,654.18, 3,981.28 and 805.31 is: 1,207.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,654.18 : 3,981.28 = 805.31 : x
  2. Step 2: Convert to fraction form
    2,654.18/3,981.28 = 805.31/x
  3. Step 3: Cross multiply
    2,654.18x = 3,981.28 × 805.31
  4. Step 4: Simplify right side
    2,654.18x = 3,206,176.31
  5. Step 5: Solve for x
    x = 3,206,176.31/2,654.18
  6. Step 6: Final answer
    x = 1,207.97

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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.