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Finding the Fourth Proportional to 825.28, 1,138.56 and 545.66

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Solution

The fourth proportional to 825.28, 1,138.56 and 545.66 is: 752.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.28 : 1,138.56 = 545.66 : x
  2. Step 2: Convert to fraction form
    825.28/1,138.56 = 545.66/x
  3. Step 3: Cross multiply
    825.28x = 1,138.56 × 545.66
  4. Step 4: Simplify right side
    825.28x = 621,266.65
  5. Step 5: Solve for x
    x = 621,266.65/825.28
  6. Step 6: Final answer
    x = 752.79

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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.