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Finding the Fourth Proportional to 421.43, 632.15 and 132.87

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Solution

The fourth proportional to 421.43, 632.15 and 132.87 is: 199.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.43 : 632.15 = 132.87 : x
  2. Step 2: Convert to fraction form
    421.43/632.15 = 132.87/x
  3. Step 3: Cross multiply
    421.43x = 632.15 × 132.87
  4. Step 4: Simplify right side
    421.43x = 83,994.10
  5. Step 5: Solve for x
    x = 83,994.10/421.43
  6. Step 6: Final answer
    x = 199.31

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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.