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Finding the Fourth Proportional to 420.98, 631.52 and 132.40

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Solution

The fourth proportional to 420.98, 631.52 and 132.40 is: 198.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.98 : 631.52 = 132.40 : x
  2. Step 2: Convert to fraction form
    420.98/631.52 = 132.40/x
  3. Step 3: Cross multiply
    420.98x = 631.52 × 132.40
  4. Step 4: Simplify right side
    420.98x = 83,609.43
  5. Step 5: Solve for x
    x = 83,609.43/420.98
  6. Step 6: Final answer
    x = 198.61

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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.