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Finding the Fourth Proportional to 723.68, 998.68 and 392.11

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Solution

The fourth proportional to 723.68, 998.68 and 392.11 is: 541.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.68 : 998.68 = 392.11 : x
  2. Step 2: Convert to fraction form
    723.68/998.68 = 392.11/x
  3. Step 3: Cross multiply
    723.68x = 998.68 × 392.11
  4. Step 4: Simplify right side
    723.68x = 391,585.46
  5. Step 5: Solve for x
    x = 391,585.46/723.68
  6. Step 6: Final answer
    x = 541.10

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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.