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Finding the Fourth Proportional to 724.72, 999.38 and 620.15

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Solution

The fourth proportional to 724.72, 999.38 and 620.15 is: 855.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.72 : 999.38 = 620.15 : x
  2. Step 2: Convert to fraction form
    724.72/999.38 = 620.15/x
  3. Step 3: Cross multiply
    724.72x = 999.38 × 620.15
  4. Step 4: Simplify right side
    724.72x = 619,764.90
  5. Step 5: Solve for x
    x = 619,764.90/724.72
  6. Step 6: Final answer
    x = 855.18

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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.