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Finding the Fourth Proportional to 724.18, 999.47 and 409.54

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Solution

The fourth proportional to 724.18, 999.47 and 409.54 is: 565.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.18 : 999.47 = 409.54 : x
  2. Step 2: Convert to fraction form
    724.18/999.47 = 409.54/x
  3. Step 3: Cross multiply
    724.18x = 999.47 × 409.54
  4. Step 4: Simplify right side
    724.18x = 409,315.90
  5. Step 5: Solve for x
    x = 409,315.90/724.18
  6. Step 6: Final answer
    x = 565.22

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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.