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Finding the Fourth Proportional to 247.20, 370.17 and 138.48

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Solution

The fourth proportional to 247.20, 370.17 and 138.48 is: 207.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.20 : 370.17 = 138.48 : x
  2. Step 2: Convert to fraction form
    247.20/370.17 = 138.48/x
  3. Step 3: Cross multiply
    247.20x = 370.17 × 138.48
  4. Step 4: Simplify right side
    247.20x = 51,261.14
  5. Step 5: Solve for x
    x = 51,261.14/247.20
  6. Step 6: Final answer
    x = 207.37

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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.