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Finding the Fourth Proportional to 824.57, 1,138.42 and 576.30

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Solution

The fourth proportional to 824.57, 1,138.42 and 576.30 is: 795.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.57 : 1,138.42 = 576.30 : x
  2. Step 2: Convert to fraction form
    824.57/1,138.42 = 576.30/x
  3. Step 3: Cross multiply
    824.57x = 1,138.42 × 576.30
  4. Step 4: Simplify right side
    824.57x = 656,071.45
  5. Step 5: Solve for x
    x = 656,071.45/824.57
  6. Step 6: Final answer
    x = 795.65

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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.