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Finding the Fourth Proportional to 724.09, 999.23 and 392.51

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Solution

The fourth proportional to 724.09, 999.23 and 392.51 is: 541.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.09 : 999.23 = 392.51 : x
  2. Step 2: Convert to fraction form
    724.09/999.23 = 392.51/x
  3. Step 3: Cross multiply
    724.09x = 999.23 × 392.51
  4. Step 4: Simplify right side
    724.09x = 392,200.81
  5. Step 5: Solve for x
    x = 392,200.81/724.09
  6. Step 6: Final answer
    x = 541.65

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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.