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Finding the Fourth Proportional to 247.20, 340.79 and 202.88

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Solution

The fourth proportional to 247.20, 340.79 and 202.88 is: 279.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.20 : 340.79 = 202.88 : x
  2. Step 2: Convert to fraction form
    247.20/340.79 = 202.88/x
  3. Step 3: Cross multiply
    247.20x = 340.79 × 202.88
  4. Step 4: Simplify right side
    247.20x = 69,136.76
  5. Step 5: Solve for x
    x = 69,136.76/247.20
  6. Step 6: Final answer
    x = 279.68

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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.