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Finding the Fourth Proportional to 243.67, 365.55 and 79.15

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Solution

The fourth proportional to 243.67, 365.55 and 79.15 is: 118.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.67 : 365.55 = 79.15 : x
  2. Step 2: Convert to fraction form
    243.67/365.55 = 79.15/x
  3. Step 3: Cross multiply
    243.67x = 365.55 × 79.15
  4. Step 4: Simplify right side
    243.67x = 28,933.28
  5. Step 5: Solve for x
    x = 28,933.28/243.67
  6. Step 6: Final answer
    x = 118.74

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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.