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Finding the Fourth Proportional to 112.19, 154.68 and 77.18

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Solution

The fourth proportional to 112.19, 154.68 and 77.18 is: 106.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.19 : 154.68 = 77.18 : x
  2. Step 2: Convert to fraction form
    112.19/154.68 = 77.18/x
  3. Step 3: Cross multiply
    112.19x = 154.68 × 77.18
  4. Step 4: Simplify right side
    112.19x = 11,938.20
  5. Step 5: Solve for x
    x = 11,938.20/112.19
  6. Step 6: Final answer
    x = 106.41

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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.