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Finding the Fourth Proportional to 121.01, 166.86 and 86.04

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Solution

The fourth proportional to 121.01, 166.86 and 86.04 is: 118.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.01 : 166.86 = 86.04 : x
  2. Step 2: Convert to fraction form
    121.01/166.86 = 86.04/x
  3. Step 3: Cross multiply
    121.01x = 166.86 × 86.04
  4. Step 4: Simplify right side
    121.01x = 14,356.63
  5. Step 5: Solve for x
    x = 14,356.63/121.01
  6. Step 6: Final answer
    x = 118.64

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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.