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Finding the Fourth Proportional to 631.56, 871.05 and 395.30

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Solution

The fourth proportional to 631.56, 871.05 and 395.30 is: 545.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.56 : 871.05 = 395.30 : x
  2. Step 2: Convert to fraction form
    631.56/871.05 = 395.30/x
  3. Step 3: Cross multiply
    631.56x = 871.05 × 395.30
  4. Step 4: Simplify right side
    631.56x = 344,324.83
  5. Step 5: Solve for x
    x = 344,324.83/631.56
  6. Step 6: Final answer
    x = 545.19

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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.