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Finding the Fourth Proportional to 824.85, 1,138.09 and 488.76

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Solution

The fourth proportional to 824.85, 1,138.09 and 488.76 is: 674.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.85 : 1,138.09 = 488.76 : x
  2. Step 2: Convert to fraction form
    824.85/1,138.09 = 488.76/x
  3. Step 3: Cross multiply
    824.85x = 1,138.09 × 488.76
  4. Step 4: Simplify right side
    824.85x = 556,250.42
  5. Step 5: Solve for x
    x = 556,250.42/824.85
  6. Step 6: Final answer
    x = 674.37

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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.