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Finding the Fourth Proportional to 243.18, 364.72 and 121.36

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Solution

The fourth proportional to 243.18, 364.72 and 121.36 is: 182.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.18 : 364.72 = 121.36 : x
  2. Step 2: Convert to fraction form
    243.18/364.72 = 121.36/x
  3. Step 3: Cross multiply
    243.18x = 364.72 × 121.36
  4. Step 4: Simplify right side
    243.18x = 44,262.42
  5. Step 5: Solve for x
    x = 44,262.42/243.18
  6. Step 6: Final answer
    x = 182.02

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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.