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Finding the Fourth Proportional to 170.32, 255.35 and 78.95

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Solution

The fourth proportional to 170.32, 255.35 and 78.95 is: 118.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.32 : 255.35 = 78.95 : x
  2. Step 2: Convert to fraction form
    170.32/255.35 = 78.95/x
  3. Step 3: Cross multiply
    170.32x = 255.35 × 78.95
  4. Step 4: Simplify right side
    170.32x = 20,159.88
  5. Step 5: Solve for x
    x = 20,159.88/170.32
  6. Step 6: Final answer
    x = 118.36

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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.