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Finding the Fourth Proportional to 631.67, 872 and 422.20

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Solution

The fourth proportional to 631.67, 872 and 422.20 is: 582.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.67 : 872 = 422.20 : x
  2. Step 2: Convert to fraction form
    631.67/872 = 422.20/x
  3. Step 3: Cross multiply
    631.67x = 872 × 422.20
  4. Step 4: Simplify right side
    631.67x = 368,158.40
  5. Step 5: Solve for x
    x = 368,158.40/631.67
  6. Step 6: Final answer
    x = 582.83

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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.