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Finding the Fourth Proportional to 247.20, 341.20 and 153.96

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Solution

The fourth proportional to 247.20, 341.20 and 153.96 is: 212.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.20 : 341.20 = 153.96 : x
  2. Step 2: Convert to fraction form
    247.20/341.20 = 153.96/x
  3. Step 3: Cross multiply
    247.20x = 341.20 × 153.96
  4. Step 4: Simplify right side
    247.20x = 52,531.15
  5. Step 5: Solve for x
    x = 52,531.15/247.20
  6. Step 6: Final answer
    x = 212.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.