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Finding the Fourth Proportional to 170.87, 256.21 and 55.29

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Solution

The fourth proportional to 170.87, 256.21 and 55.29 is: 82.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.87 : 256.21 = 55.29 : x
  2. Step 2: Convert to fraction form
    170.87/256.21 = 55.29/x
  3. Step 3: Cross multiply
    170.87x = 256.21 × 55.29
  4. Step 4: Simplify right side
    170.87x = 14,164.29
  5. Step 5: Solve for x
    x = 14,164.29/170.87
  6. Step 6: Final answer
    x = 82.90

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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.