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Finding the Fourth Proportional to 421.36, 632.16 and 132.88

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Solution

The fourth proportional to 421.36, 632.16 and 132.88 is: 199.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.36 : 632.16 = 132.88 : x
  2. Step 2: Convert to fraction form
    421.36/632.16 = 132.88/x
  3. Step 3: Cross multiply
    421.36x = 632.16 × 132.88
  4. Step 4: Simplify right side
    421.36x = 84,001.42
  5. Step 5: Solve for x
    x = 84,001.42/421.36
  6. Step 6: Final answer
    x = 199.36

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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.