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Finding the Fourth Proportional to 423.66, 634.95 and 218.07

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Solution

The fourth proportional to 423.66, 634.95 and 218.07 is: 326.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.66 : 634.95 = 218.07 : x
  2. Step 2: Convert to fraction form
    423.66/634.95 = 218.07/x
  3. Step 3: Cross multiply
    423.66x = 634.95 × 218.07
  4. Step 4: Simplify right side
    423.66x = 138,463.55
  5. Step 5: Solve for x
    x = 138,463.55/423.66
  6. Step 6: Final answer
    x = 326.83

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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.