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Finding the Fourth Proportional to 724.65, 999.90 and 414.15

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Solution

The fourth proportional to 724.65, 999.90 and 414.15 is: 571.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.65 : 999.90 = 414.15 : x
  2. Step 2: Convert to fraction form
    724.65/999.90 = 414.15/x
  3. Step 3: Cross multiply
    724.65x = 999.90 × 414.15
  4. Step 4: Simplify right side
    724.65x = 414,108.59
  5. Step 5: Solve for x
    x = 414,108.59/724.65
  6. Step 6: Final answer
    x = 571.46

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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.