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Finding the Fourth Proportional to 723.99, 999.12 and 392.42

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Solution

The fourth proportional to 723.99, 999.12 and 392.42 is: 541.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.99 : 999.12 = 392.42 : x
  2. Step 2: Convert to fraction form
    723.99/999.12 = 392.42/x
  3. Step 3: Cross multiply
    723.99x = 999.12 × 392.42
  4. Step 4: Simplify right side
    723.99x = 392,074.67
  5. Step 5: Solve for x
    x = 392,074.67/723.99
  6. Step 6: Final answer
    x = 541.55

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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.