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Finding the Fourth Proportional to 287.96, 431.96 and 82.55

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Solution

The fourth proportional to 287.96, 431.96 and 82.55 is: 123.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.96 : 431.96 = 82.55 : x
  2. Step 2: Convert to fraction form
    287.96/431.96 = 82.55/x
  3. Step 3: Cross multiply
    287.96x = 431.96 × 82.55
  4. Step 4: Simplify right side
    287.96x = 35,655.73
  5. Step 5: Solve for x
    x = 35,655.73/287.96
  6. Step 6: Final answer
    x = 123.82

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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.