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Finding the Fourth Proportional to 932.56, 1,396.92 and 921.04

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Solution

The fourth proportional to 932.56, 1,396.92 and 921.04 is: 1,379.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.56 : 1,396.92 = 921.04 : x
  2. Step 2: Convert to fraction form
    932.56/1,396.92 = 921.04/x
  3. Step 3: Cross multiply
    932.56x = 1,396.92 × 921.04
  4. Step 4: Simplify right side
    932.56x = 1,286,619.20
  5. Step 5: Solve for x
    x = 1,286,619.20/932.56
  6. Step 6: Final answer
    x = 1,379.66

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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.