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Finding the Fourth Proportional to 724.21, 999.41 and 392.64

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Solution

The fourth proportional to 724.21, 999.41 and 392.64 is: 541.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.21 : 999.41 = 392.64 : x
  2. Step 2: Convert to fraction form
    724.21/999.41 = 392.64/x
  3. Step 3: Cross multiply
    724.21x = 999.41 × 392.64
  4. Step 4: Simplify right side
    724.21x = 392,401.38
  5. Step 5: Solve for x
    x = 392,401.38/724.21
  6. Step 6: Final answer
    x = 541.84

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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.