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Finding the Fourth Proportional to 721.12, 994.80 and 514.24

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Solution

The fourth proportional to 721.12, 994.80 and 514.24 is: 709.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.12 : 994.80 = 514.24 : x
  2. Step 2: Convert to fraction form
    721.12/994.80 = 514.24/x
  3. Step 3: Cross multiply
    721.12x = 994.80 × 514.24
  4. Step 4: Simplify right side
    721.12x = 511,565.95
  5. Step 5: Solve for x
    x = 511,565.95/721.12
  6. Step 6: Final answer
    x = 709.40

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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.