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Finding the Fourth Proportional to 247.20, 340.80 and 208.32

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Solution

The fourth proportional to 247.20, 340.80 and 208.32 is: 287.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.20 : 340.80 = 208.32 : x
  2. Step 2: Convert to fraction form
    247.20/340.80 = 208.32/x
  3. Step 3: Cross multiply
    247.20x = 340.80 × 208.32
  4. Step 4: Simplify right side
    247.20x = 70,995.46
  5. Step 5: Solve for x
    x = 70,995.46/247.20
  6. Step 6: Final answer
    x = 287.20

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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.