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Finding the Fourth Proportional to 243.24, 364.88 and 81.04

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Solution

The fourth proportional to 243.24, 364.88 and 81.04 is: 121.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.24 : 364.88 = 81.04 : x
  2. Step 2: Convert to fraction form
    243.24/364.88 = 81.04/x
  3. Step 3: Cross multiply
    243.24x = 364.88 × 81.04
  4. Step 4: Simplify right side
    243.24x = 29,569.88
  5. Step 5: Solve for x
    x = 29,569.88/243.24
  6. Step 6: Final answer
    x = 121.57

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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.