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Finding the Fourth Proportional to 631.54, 871.28 and 382.86

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Solution

The fourth proportional to 631.54, 871.28 and 382.86 is: 528.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.54 : 871.28 = 382.86 : x
  2. Step 2: Convert to fraction form
    631.54/871.28 = 382.86/x
  3. Step 3: Cross multiply
    631.54x = 871.28 × 382.86
  4. Step 4: Simplify right side
    631.54x = 333,578.26
  5. Step 5: Solve for x
    x = 333,578.26/631.54
  6. Step 6: Final answer
    x = 528.20

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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.