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Finding the Fourth Proportional to 721.02, 993.45 and 487.74

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Solution

The fourth proportional to 721.02, 993.45 and 487.74 is: 672.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.02 : 993.45 = 487.74 : x
  2. Step 2: Convert to fraction form
    721.02/993.45 = 487.74/x
  3. Step 3: Cross multiply
    721.02x = 993.45 × 487.74
  4. Step 4: Simplify right side
    721.02x = 484,545.30
  5. Step 5: Solve for x
    x = 484,545.30/721.02
  6. Step 6: Final answer
    x = 672.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.