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Finding the Fourth Proportional to 287.29, 431.12 and 165.79

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Solution

The fourth proportional to 287.29, 431.12 and 165.79 is: 248.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.29 : 431.12 = 165.79 : x
  2. Step 2: Convert to fraction form
    287.29/431.12 = 165.79/x
  3. Step 3: Cross multiply
    287.29x = 431.12 × 165.79
  4. Step 4: Simplify right side
    287.29x = 71,475.38
  5. Step 5: Solve for x
    x = 71,475.38/287.29
  6. Step 6: Final answer
    x = 248.79

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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.