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Finding the Fourth Proportional to 243.50, 365.42 and 99.22

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Solution

The fourth proportional to 243.50, 365.42 and 99.22 is: 148.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.50 : 365.42 = 99.22 : x
  2. Step 2: Convert to fraction form
    243.50/365.42 = 99.22/x
  3. Step 3: Cross multiply
    243.50x = 365.42 × 99.22
  4. Step 4: Simplify right side
    243.50x = 36,256.97
  5. Step 5: Solve for x
    x = 36,256.97/243.50
  6. Step 6: Final answer
    x = 148.90

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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.