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Finding the Fourth Proportional to 824.92, 1,138.74 and 545.28

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Solution

The fourth proportional to 824.92, 1,138.74 and 545.28 is: 752.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.92 : 1,138.74 = 545.28 : x
  2. Step 2: Convert to fraction form
    824.92/1,138.74 = 545.28/x
  3. Step 3: Cross multiply
    824.92x = 1,138.74 × 545.28
  4. Step 4: Simplify right side
    824.92x = 620,932.15
  5. Step 5: Solve for x
    x = 620,932.15/824.92
  6. Step 6: Final answer
    x = 752.72

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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.