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Finding the Fourth Proportional to 421.28, 632.15 and 267.28

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Solution

The fourth proportional to 421.28, 632.15 and 267.28 is: 401.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.28 : 632.15 = 267.28 : x
  2. Step 2: Convert to fraction form
    421.28/632.15 = 267.28/x
  3. Step 3: Cross multiply
    421.28x = 632.15 × 267.28
  4. Step 4: Simplify right side
    421.28x = 168,964.20
  5. Step 5: Solve for x
    x = 168,964.20/421.28
  6. Step 6: Final answer
    x = 401.07

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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.