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Finding the Fourth Proportional to 421.23, 632.17 and 215.97

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Solution

The fourth proportional to 421.23, 632.17 and 215.97 is: 324.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.23 : 632.17 = 215.97 : x
  2. Step 2: Convert to fraction form
    421.23/632.17 = 215.97/x
  3. Step 3: Cross multiply
    421.23x = 632.17 × 215.97
  4. Step 4: Simplify right side
    421.23x = 136,529.75
  5. Step 5: Solve for x
    x = 136,529.75/421.23
  6. Step 6: Final answer
    x = 324.12

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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.