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Finding the Fourth Proportional to 720.52, 994.04 and 487.80

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Solution

The fourth proportional to 720.52, 994.04 and 487.80 is: 672.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.52 : 994.04 = 487.80 : x
  2. Step 2: Convert to fraction form
    720.52/994.04 = 487.80/x
  3. Step 3: Cross multiply
    720.52x = 994.04 × 487.80
  4. Step 4: Simplify right side
    720.52x = 484,892.71
  5. Step 5: Solve for x
    x = 484,892.71/720.52
  6. Step 6: Final answer
    x = 672.98

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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.