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Finding the Fourth Proportional to 825.31, 1,138.89 and 475.93

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Solution

The fourth proportional to 825.31, 1,138.89 and 475.93 is: 656.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.31 : 1,138.89 = 475.93 : x
  2. Step 2: Convert to fraction form
    825.31/1,138.89 = 475.93/x
  3. Step 3: Cross multiply
    825.31x = 1,138.89 × 475.93
  4. Step 4: Simplify right side
    825.31x = 542,031.92
  5. Step 5: Solve for x
    x = 542,031.92/825.31
  6. Step 6: Final answer
    x = 656.76

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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.