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Finding the Fourth Proportional to 724.79, 1,000.21 and 410.05

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Solution

The fourth proportional to 724.79, 1,000.21 and 410.05 is: 565.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.79 : 1,000.21 = 410.05 : x
  2. Step 2: Convert to fraction form
    724.79/1,000.21 = 410.05/x
  3. Step 3: Cross multiply
    724.79x = 1,000.21 × 410.05
  4. Step 4: Simplify right side
    724.79x = 410,136.11
  5. Step 5: Solve for x
    x = 410,136.11/724.79
  6. Step 6: Final answer
    x = 565.87

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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.