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Finding the Fourth Proportional to 243.72, 365.49 and 99.39

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Solution

The fourth proportional to 243.72, 365.49 and 99.39 is: 149.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.72 : 365.49 = 99.39 : x
  2. Step 2: Convert to fraction form
    243.72/365.49 = 99.39/x
  3. Step 3: Cross multiply
    243.72x = 365.49 × 99.39
  4. Step 4: Simplify right side
    243.72x = 36,326.05
  5. Step 5: Solve for x
    x = 36,326.05/243.72
  6. Step 6: Final answer
    x = 149.05

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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.