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Finding the Fourth Proportional to 170.28, 255.47 and 78.95

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Solution

The fourth proportional to 170.28, 255.47 and 78.95 is: 118.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.28 : 255.47 = 78.95 : x
  2. Step 2: Convert to fraction form
    170.28/255.47 = 78.95/x
  3. Step 3: Cross multiply
    170.28x = 255.47 × 78.95
  4. Step 4: Simplify right side
    170.28x = 20,169.60
  5. Step 5: Solve for x
    x = 20,169.60/170.28
  6. Step 6: Final answer
    x = 118.45

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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.