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Finding the Fourth Proportional to 825.20, 1,138.76 and 475.76

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Solution

The fourth proportional to 825.20, 1,138.76 and 475.76 is: 656.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.20 : 1,138.76 = 475.76 : x
  2. Step 2: Convert to fraction form
    825.20/1,138.76 = 475.76/x
  3. Step 3: Cross multiply
    825.20x = 1,138.76 × 475.76
  4. Step 4: Simplify right side
    825.20x = 541,776.46
  5. Step 5: Solve for x
    x = 541,776.46/825.20
  6. Step 6: Final answer
    x = 656.54

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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.