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Finding the Fourth Proportional to 251.32, 347.16 and 208.20

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Solution

The fourth proportional to 251.32, 347.16 and 208.20 is: 287.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.32 : 347.16 = 208.20 : x
  2. Step 2: Convert to fraction form
    251.32/347.16 = 208.20/x
  3. Step 3: Cross multiply
    251.32x = 347.16 × 208.20
  4. Step 4: Simplify right side
    251.32x = 72,278.71
  5. Step 5: Solve for x
    x = 72,278.71/251.32
  6. Step 6: Final answer
    x = 287.60

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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.