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Finding the Fourth Proportional to 824.64, 1,138.05 and 475.38

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Solution

The fourth proportional to 824.64, 1,138.05 and 475.38 is: 656.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.64 : 1,138.05 = 475.38 : x
  2. Step 2: Convert to fraction form
    824.64/1,138.05 = 475.38/x
  3. Step 3: Cross multiply
    824.64x = 1,138.05 × 475.38
  4. Step 4: Simplify right side
    824.64x = 541,006.21
  5. Step 5: Solve for x
    x = 541,006.21/824.64
  6. Step 6: Final answer
    x = 656.05

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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.