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Finding the Fourth Proportional to 170.98, 235.98 and 121.87

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Solution

The fourth proportional to 170.98, 235.98 and 121.87 is: 168.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.98 : 235.98 = 121.87 : x
  2. Step 2: Convert to fraction form
    170.98/235.98 = 121.87/x
  3. Step 3: Cross multiply
    170.98x = 235.98 × 121.87
  4. Step 4: Simplify right side
    170.98x = 28,758.88
  5. Step 5: Solve for x
    x = 28,758.88/170.98
  6. Step 6: Final answer
    x = 168.20

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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.