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Finding the Fourth Proportional to 170.90, 235.84 and 111.91

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Solution

The fourth proportional to 170.90, 235.84 and 111.91 is: 154.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.90 : 235.84 = 111.91 : x
  2. Step 2: Convert to fraction form
    170.90/235.84 = 111.91/x
  3. Step 3: Cross multiply
    170.90x = 235.84 × 111.91
  4. Step 4: Simplify right side
    170.90x = 26,391.99
  5. Step 5: Solve for x
    x = 26,391.99/170.90
  6. Step 6: Final answer
    x = 154.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.