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Finding the Fourth Proportional to 208.32, 287.35 and 129.68

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Solution

The fourth proportional to 208.32, 287.35 and 129.68 is: 178.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.32 : 287.35 = 129.68 : x
  2. Step 2: Convert to fraction form
    208.32/287.35 = 129.68/x
  3. Step 3: Cross multiply
    208.32x = 287.35 × 129.68
  4. Step 4: Simplify right side
    208.32x = 37,263.55
  5. Step 5: Solve for x
    x = 37,263.55/208.32
  6. Step 6: Final answer
    x = 178.88

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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.