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Finding the Fourth Proportional to 240.79, 359.38 and 221.55

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Solution

The fourth proportional to 240.79, 359.38 and 221.55 is: 330.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    240.79 : 359.38 = 221.55 : x
  2. Step 2: Convert to fraction form
    240.79/359.38 = 221.55/x
  3. Step 3: Cross multiply
    240.79x = 359.38 × 221.55
  4. Step 4: Simplify right side
    240.79x = 79,617.73
  5. Step 5: Solve for x
    x = 79,617.73/240.79
  6. Step 6: Final answer
    x = 330.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.