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Finding the Fourth Proportional to 243.76, 365.90 and 115.76

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Solution

The fourth proportional to 243.76, 365.90 and 115.76 is: 173.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.76 : 365.90 = 115.76 : x
  2. Step 2: Convert to fraction form
    243.76/365.90 = 115.76/x
  3. Step 3: Cross multiply
    243.76x = 365.90 × 115.76
  4. Step 4: Simplify right side
    243.76x = 42,356.58
  5. Step 5: Solve for x
    x = 42,356.58/243.76
  6. Step 6: Final answer
    x = 173.76

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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.