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Finding the Fourth Proportional to 243.12, 364.75 and 80.91

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Solution

The fourth proportional to 243.12, 364.75 and 80.91 is: 121.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.12 : 364.75 = 80.91 : x
  2. Step 2: Convert to fraction form
    243.12/364.75 = 80.91/x
  3. Step 3: Cross multiply
    243.12x = 364.75 × 80.91
  4. Step 4: Simplify right side
    243.12x = 29,511.92
  5. Step 5: Solve for x
    x = 29,511.92/243.12
  6. Step 6: Final answer
    x = 121.39

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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.