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Finding the Fourth Proportional to 243.20, 365.12 and 147.20

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Solution

The fourth proportional to 243.20, 365.12 and 147.20 is: 220.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.20 : 365.12 = 147.20 : x
  2. Step 2: Convert to fraction form
    243.20/365.12 = 147.20/x
  3. Step 3: Cross multiply
    243.20x = 365.12 × 147.20
  4. Step 4: Simplify right side
    243.20x = 53,745.66
  5. Step 5: Solve for x
    x = 53,745.66/243.20
  6. Step 6: Final answer
    x = 220.99

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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.