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Finding the Fourth Proportional to 824.55, 1,139.32 and 660.12

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Solution

The fourth proportional to 824.55, 1,139.32 and 660.12 is: 912.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.55 : 1,139.32 = 660.12 : x
  2. Step 2: Convert to fraction form
    824.55/1,139.32 = 660.12/x
  3. Step 3: Cross multiply
    824.55x = 1,139.32 × 660.12
  4. Step 4: Simplify right side
    824.55x = 752,087.92
  5. Step 5: Solve for x
    x = 752,087.92/824.55
  6. Step 6: Final answer
    x = 912.12

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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.