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Finding the Fourth Proportional to 723.90, 998.98 and 392.33

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Solution

The fourth proportional to 723.90, 998.98 and 392.33 is: 541.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.90 : 998.98 = 392.33 : x
  2. Step 2: Convert to fraction form
    723.90/998.98 = 392.33/x
  3. Step 3: Cross multiply
    723.90x = 998.98 × 392.33
  4. Step 4: Simplify right side
    723.90x = 391,922.87
  5. Step 5: Solve for x
    x = 391,922.87/723.90
  6. Step 6: Final answer
    x = 541.40

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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.