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Finding the Fourth Proportional to 170.24, 255.23 and 78.81

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Solution

The fourth proportional to 170.24, 255.23 and 78.81 is: 118.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.24 : 255.23 = 78.81 : x
  2. Step 2: Convert to fraction form
    170.24/255.23 = 78.81/x
  3. Step 3: Cross multiply
    170.24x = 255.23 × 78.81
  4. Step 4: Simplify right side
    170.24x = 20,113.01
  5. Step 5: Solve for x
    x = 20,113.01/170.24
  6. Step 6: Final answer
    x = 118.15

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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.