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Finding the Fourth Proportional to 170.85, 256.15 and 55.23

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Solution

The fourth proportional to 170.85, 256.15 and 55.23 is: 82.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.85 : 256.15 = 55.23 : x
  2. Step 2: Convert to fraction form
    170.85/256.15 = 55.23/x
  3. Step 3: Cross multiply
    170.85x = 256.15 × 55.23
  4. Step 4: Simplify right side
    170.85x = 14,147.16
  5. Step 5: Solve for x
    x = 14,147.16/170.85
  6. Step 6: Final answer
    x = 82.80

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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.