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Finding the Fourth Proportional to 112.28, 154.90 and 77.80

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Solution

The fourth proportional to 112.28, 154.90 and 77.80 is: 107.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.28 : 154.90 = 77.80 : x
  2. Step 2: Convert to fraction form
    112.28/154.90 = 77.80/x
  3. Step 3: Cross multiply
    112.28x = 154.90 × 77.80
  4. Step 4: Simplify right side
    112.28x = 12,051.22
  5. Step 5: Solve for x
    x = 12,051.22/112.28
  6. Step 6: Final answer
    x = 107.33

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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.