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Finding the Fourth Proportional to 723.75, 999.15 and 680.55

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Solution

The fourth proportional to 723.75, 999.15 and 680.55 is: 939.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.75 : 999.15 = 680.55 : x
  2. Step 2: Convert to fraction form
    723.75/999.15 = 680.55/x
  3. Step 3: Cross multiply
    723.75x = 999.15 × 680.55
  4. Step 4: Simplify right side
    723.75x = 679,971.53
  5. Step 5: Solve for x
    x = 679,971.53/723.75
  6. Step 6: Final answer
    x = 939.51

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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.