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Finding the Fourth Proportional to 247.20, 340.99 and 153.96

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Solution

The fourth proportional to 247.20, 340.99 and 153.96 is: 212.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.20 : 340.99 = 153.96 : x
  2. Step 2: Convert to fraction form
    247.20/340.99 = 153.96/x
  3. Step 3: Cross multiply
    247.20x = 340.99 × 153.96
  4. Step 4: Simplify right side
    247.20x = 52,498.82
  5. Step 5: Solve for x
    x = 52,498.82/247.20
  6. Step 6: Final answer
    x = 212.37

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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.