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Finding the Fourth Proportional to 218.61, 327.98 and 158.21

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Solution

The fourth proportional to 218.61, 327.98 and 158.21 is: 237.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.61 : 327.98 = 158.21 : x
  2. Step 2: Convert to fraction form
    218.61/327.98 = 158.21/x
  3. Step 3: Cross multiply
    218.61x = 327.98 × 158.21
  4. Step 4: Simplify right side
    218.61x = 51,887.28
  5. Step 5: Solve for x
    x = 51,887.28/218.61
  6. Step 6: Final answer
    x = 237.35

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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.