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Finding the Fourth Proportional to 243.85, 366.11 and 128.38

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Solution

The fourth proportional to 243.85, 366.11 and 128.38 is: 192.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.85 : 366.11 = 128.38 : x
  2. Step 2: Convert to fraction form
    243.85/366.11 = 128.38/x
  3. Step 3: Cross multiply
    243.85x = 366.11 × 128.38
  4. Step 4: Simplify right side
    243.85x = 47,001.20
  5. Step 5: Solve for x
    x = 47,001.20/243.85
  6. Step 6: Final answer
    x = 192.75

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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.