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Finding the Fourth Proportional to 2,489.32, 3,731.92 and 928.46

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Solution

The fourth proportional to 2,489.32, 3,731.92 and 928.46 is: 1,391.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,489.32 : 3,731.92 = 928.46 : x
  2. Step 2: Convert to fraction form
    2,489.32/3,731.92 = 928.46/x
  3. Step 3: Cross multiply
    2,489.32x = 3,731.92 × 928.46
  4. Step 4: Simplify right side
    2,489.32x = 3,464,938.44
  5. Step 5: Solve for x
    x = 3,464,938.44/2,489.32
  6. Step 6: Final answer
    x = 1,391.92

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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.