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Finding the Fourth Proportional to 170.49, 255.68 and 72.89

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Solution

The fourth proportional to 170.49, 255.68 and 72.89 is: 109.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.49 : 255.68 = 72.89 : x
  2. Step 2: Convert to fraction form
    170.49/255.68 = 72.89/x
  3. Step 3: Cross multiply
    170.49x = 255.68 × 72.89
  4. Step 4: Simplify right side
    170.49x = 18,634.87
  5. Step 5: Solve for x
    x = 18,634.87/170.49
  6. Step 6: Final answer
    x = 109.30

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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.