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Finding the Fourth Proportional to 120.95, 166.91 and 65.69

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Solution

The fourth proportional to 120.95, 166.91 and 65.69 is: 90.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.95 : 166.91 = 65.69 : x
  2. Step 2: Convert to fraction form
    120.95/166.91 = 65.69/x
  3. Step 3: Cross multiply
    120.95x = 166.91 × 65.69
  4. Step 4: Simplify right side
    120.95x = 10,964.71
  5. Step 5: Solve for x
    x = 10,964.71/120.95
  6. Step 6: Final answer
    x = 90.65

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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.