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Finding the Fourth Proportional to 423.55, 634.54 and 218.24

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Solution

The fourth proportional to 423.55, 634.54 and 218.24 is: 326.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.55 : 634.54 = 218.24 : x
  2. Step 2: Convert to fraction form
    423.55/634.54 = 218.24/x
  3. Step 3: Cross multiply
    423.55x = 634.54 × 218.24
  4. Step 4: Simplify right side
    423.55x = 138,483.05
  5. Step 5: Solve for x
    x = 138,483.05/423.55
  6. Step 6: Final answer
    x = 326.96

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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.