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Finding the Fourth Proportional to 286.32, 429.45 and 80.88

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Solution

The fourth proportional to 286.32, 429.45 and 80.88 is: 121.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.32 : 429.45 = 80.88 : x
  2. Step 2: Convert to fraction form
    286.32/429.45 = 80.88/x
  3. Step 3: Cross multiply
    286.32x = 429.45 × 80.88
  4. Step 4: Simplify right side
    286.32x = 34,731.97
  5. Step 5: Solve for x
    x = 34,731.97/286.32
  6. Step 6: Final answer
    x = 121.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.