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Finding the Fourth Proportional to 121.88, 182.86 and 85.35

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Solution

The fourth proportional to 121.88, 182.86 and 85.35 is: 128.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.88 : 182.86 = 85.35 : x
  2. Step 2: Convert to fraction form
    121.88/182.86 = 85.35/x
  3. Step 3: Cross multiply
    121.88x = 182.86 × 85.35
  4. Step 4: Simplify right side
    121.88x = 15,607.57
  5. Step 5: Solve for x
    x = 15,607.57/121.88
  6. Step 6: Final answer
    x = 128.06

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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.