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Finding the Fourth Proportional to 421.62, 632.52 and 129.11

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Solution

The fourth proportional to 421.62, 632.52 and 129.11 is: 193.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.62 : 632.52 = 129.11 : x
  2. Step 2: Convert to fraction form
    421.62/632.52 = 129.11/x
  3. Step 3: Cross multiply
    421.62x = 632.52 × 129.11
  4. Step 4: Simplify right side
    421.62x = 81,666.24
  5. Step 5: Solve for x
    x = 81,666.24/421.62
  6. Step 6: Final answer
    x = 193.70

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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.