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Finding the Fourth Proportional to 724.14, 999.32 and 392.57

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Solution

The fourth proportional to 724.14, 999.32 and 392.57 is: 541.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.14 : 999.32 = 392.57 : x
  2. Step 2: Convert to fraction form
    724.14/999.32 = 392.57/x
  3. Step 3: Cross multiply
    724.14x = 999.32 × 392.57
  4. Step 4: Simplify right side
    724.14x = 392,297.03
  5. Step 5: Solve for x
    x = 392,297.03/724.14
  6. Step 6: Final answer
    x = 541.74

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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.