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Finding the Fourth Proportional to 287.88, 431.67 and 170.87

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Solution

The fourth proportional to 287.88, 431.67 and 170.87 is: 256.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.88 : 431.67 = 170.87 : x
  2. Step 2: Convert to fraction form
    287.88/431.67 = 170.87/x
  3. Step 3: Cross multiply
    287.88x = 431.67 × 170.87
  4. Step 4: Simplify right side
    287.88x = 73,757.94
  5. Step 5: Solve for x
    x = 73,757.94/287.88
  6. Step 6: Final answer
    x = 256.21

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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.