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Finding the Fourth Proportional to 723.20, 998.03 and 391.64

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Solution

The fourth proportional to 723.20, 998.03 and 391.64 is: 540.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.20 : 998.03 = 391.64 : x
  2. Step 2: Convert to fraction form
    723.20/998.03 = 391.64/x
  3. Step 3: Cross multiply
    723.20x = 998.03 × 391.64
  4. Step 4: Simplify right side
    723.20x = 390,861.52
  5. Step 5: Solve for x
    x = 390,861.52/723.20
  6. Step 6: Final answer
    x = 540.46

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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.