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Finding the Fourth Proportional to 423.57, 634.76 and 217.63

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Solution

The fourth proportional to 423.57, 634.76 and 217.63 is: 326.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.57 : 634.76 = 217.63 : x
  2. Step 2: Convert to fraction form
    423.57/634.76 = 217.63/x
  3. Step 3: Cross multiply
    423.57x = 634.76 × 217.63
  4. Step 4: Simplify right side
    423.57x = 138,142.82
  5. Step 5: Solve for x
    x = 138,142.82/423.57
  6. Step 6: Final answer
    x = 326.14

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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.