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Finding the Fourth Proportional to 992.32, 1,489.56 and 680.20

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Solution

The fourth proportional to 992.32, 1,489.56 and 680.20 is: 1,021.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.32 : 1,489.56 = 680.20 : x
  2. Step 2: Convert to fraction form
    992.32/1,489.56 = 680.20/x
  3. Step 3: Cross multiply
    992.32x = 1,489.56 × 680.20
  4. Step 4: Simplify right side
    992.32x = 1,013,198.71
  5. Step 5: Solve for x
    x = 1,013,198.71/992.32
  6. Step 6: Final answer
    x = 1,021.04

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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.