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Finding the Fourth Proportional to 287.62, 431.50 and 82.20

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Solution

The fourth proportional to 287.62, 431.50 and 82.20 is: 123.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.62 : 431.50 = 82.20 : x
  2. Step 2: Convert to fraction form
    287.62/431.50 = 82.20/x
  3. Step 3: Cross multiply
    287.62x = 431.50 × 82.20
  4. Step 4: Simplify right side
    287.62x = 35,469.30
  5. Step 5: Solve for x
    x = 35,469.30/287.62
  6. Step 6: Final answer
    x = 123.32

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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.