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Finding the Fourth Proportional to 170.30, 255.36 and 78.95

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Solution

The fourth proportional to 170.30, 255.36 and 78.95 is: 118.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.30 : 255.36 = 78.95 : x
  2. Step 2: Convert to fraction form
    170.30/255.36 = 78.95/x
  3. Step 3: Cross multiply
    170.30x = 255.36 × 78.95
  4. Step 4: Simplify right side
    170.30x = 20,160.67
  5. Step 5: Solve for x
    x = 20,160.67/170.30
  6. Step 6: Final answer
    x = 118.38

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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.