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Finding the Fourth Proportional to 1,324.92, 1,987.32 and 631.92

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Solution

The fourth proportional to 1,324.92, 1,987.32 and 631.92 is: 947.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,324.92 : 1,987.32 = 631.92 : x
  2. Step 2: Convert to fraction form
    1,324.92/1,987.32 = 631.92/x
  3. Step 3: Cross multiply
    1,324.92x = 1,987.32 × 631.92
  4. Step 4: Simplify right side
    1,324.92x = 1,255,827.25
  5. Step 5: Solve for x
    x = 1,255,827.25/1,324.92
  6. Step 6: Final answer
    x = 947.85

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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.