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Finding the Fourth Proportional to 120.84, 166.65 and 77.19

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Solution

The fourth proportional to 120.84, 166.65 and 77.19 is: 106.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.84 : 166.65 = 77.19 : x
  2. Step 2: Convert to fraction form
    120.84/166.65 = 77.19/x
  3. Step 3: Cross multiply
    120.84x = 166.65 × 77.19
  4. Step 4: Simplify right side
    120.84x = 12,863.71
  5. Step 5: Solve for x
    x = 12,863.71/120.84
  6. Step 6: Final answer
    x = 106.45

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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.