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Finding the Fourth Proportional to 723.05, 997.80 and 391.48

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Solution

The fourth proportional to 723.05, 997.80 and 391.48 is: 540.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.05 : 997.80 = 391.48 : x
  2. Step 2: Convert to fraction form
    723.05/997.80 = 391.48/x
  3. Step 3: Cross multiply
    723.05x = 997.80 × 391.48
  4. Step 4: Simplify right side
    723.05x = 390,618.74
  5. Step 5: Solve for x
    x = 390,618.74/723.05
  6. Step 6: Final answer
    x = 540.24

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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.