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Finding the Fourth Proportional to 170.91, 256.38 and 53.79

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Solution

The fourth proportional to 170.91, 256.38 and 53.79 is: 80.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.91 : 256.38 = 53.79 : x
  2. Step 2: Convert to fraction form
    170.91/256.38 = 53.79/x
  3. Step 3: Cross multiply
    170.91x = 256.38 × 53.79
  4. Step 4: Simplify right side
    170.91x = 13,790.68
  5. Step 5: Solve for x
    x = 13,790.68/170.91
  6. Step 6: Final answer
    x = 80.69

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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.