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Finding the Fourth Proportional to 170.36, 255.51 and 54.78

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Solution

The fourth proportional to 170.36, 255.51 and 54.78 is: 82.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.36 : 255.51 = 54.78 : x
  2. Step 2: Convert to fraction form
    170.36/255.51 = 54.78/x
  3. Step 3: Cross multiply
    170.36x = 255.51 × 54.78
  4. Step 4: Simplify right side
    170.36x = 13,995.69
  5. Step 5: Solve for x
    x = 13,995.69/170.36
  6. Step 6: Final answer
    x = 82.15

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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.