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Finding the Fourth Proportional to 631.60, 871.68 and 395.68

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Solution

The fourth proportional to 631.60, 871.68 and 395.68 is: 546.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.60 : 871.68 = 395.68 : x
  2. Step 2: Convert to fraction form
    631.60/871.68 = 395.68/x
  3. Step 3: Cross multiply
    631.60x = 871.68 × 395.68
  4. Step 4: Simplify right side
    631.60x = 344,906.34
  5. Step 5: Solve for x
    x = 344,906.34/631.60
  6. Step 6: Final answer
    x = 546.08

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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.