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Finding the Fourth Proportional to 243.36, 365.08 and 87.18

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Solution

The fourth proportional to 243.36, 365.08 and 87.18 is: 130.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.36 : 365.08 = 87.18 : x
  2. Step 2: Convert to fraction form
    243.36/365.08 = 87.18/x
  3. Step 3: Cross multiply
    243.36x = 365.08 × 87.18
  4. Step 4: Simplify right side
    243.36x = 31,826.41
  5. Step 5: Solve for x
    x = 31,826.41/243.36
  6. Step 6: Final answer
    x = 130.78

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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.