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Finding the Fourth Proportional to 421.74, 631.28 and 267.12

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Solution

The fourth proportional to 421.74, 631.28 and 267.12 is: 399.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.74 : 631.28 = 267.12 : x
  2. Step 2: Convert to fraction form
    421.74/631.28 = 267.12/x
  3. Step 3: Cross multiply
    421.74x = 631.28 × 267.12
  4. Step 4: Simplify right side
    421.74x = 168,626.18
  5. Step 5: Solve for x
    x = 168,626.18/421.74
  6. Step 6: Final answer
    x = 399.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.