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Finding the Fourth Proportional to 990.52, 1,487.21 and 717.96

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Solution

The fourth proportional to 990.52, 1,487.21 and 717.96 is: 1,077.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.52 : 1,487.21 = 717.96 : x
  2. Step 2: Convert to fraction form
    990.52/1,487.21 = 717.96/x
  3. Step 3: Cross multiply
    990.52x = 1,487.21 × 717.96
  4. Step 4: Simplify right side
    990.52x = 1,067,757.29
  5. Step 5: Solve for x
    x = 1,067,757.29/990.52
  6. Step 6: Final answer
    x = 1,077.98

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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.