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Finding the Fourth Proportional to 631.52, 871.44 and 398.64

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Solution

The fourth proportional to 631.52, 871.44 and 398.64 is: 550.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.52 : 871.44 = 398.64 : x
  2. Step 2: Convert to fraction form
    631.52/871.44 = 398.64/x
  3. Step 3: Cross multiply
    631.52x = 871.44 × 398.64
  4. Step 4: Simplify right side
    631.52x = 347,390.84
  5. Step 5: Solve for x
    x = 347,390.84/631.52
  6. Step 6: Final answer
    x = 550.09

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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.