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Finding the Fourth Proportional to 121, 166.86 and 96.16

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Solution

The fourth proportional to 121, 166.86 and 96.16 is: 132.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    121 : 166.86 = 96.16 : x
  2. Step 2: Convert to fraction form
    121/166.86 = 96.16/x
  3. Step 3: Cross multiply
    121x = 166.86 × 96.16
  4. Step 4: Simplify right side
    121x = 16,045.26
  5. Step 5: Solve for x
    x = 16,045.26/121
  6. Step 6: Final answer
    x = 132.61

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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.