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Finding the Fourth Proportional to 170.21, 255.16 and 89.11

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Solution

The fourth proportional to 170.21, 255.16 and 89.11 is: 133.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.21 : 255.16 = 89.11 : x
  2. Step 2: Convert to fraction form
    170.21/255.16 = 89.11/x
  3. Step 3: Cross multiply
    170.21x = 255.16 × 89.11
  4. Step 4: Simplify right side
    170.21x = 22,735.59
  5. Step 5: Solve for x
    x = 22,735.59/170.21
  6. Step 6: Final answer
    x = 133.57

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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.