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Finding the Fourth Proportional to 107.68, 149.40 and 106.60

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Solution

The fourth proportional to 107.68, 149.40 and 106.60 is: 147.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.68 : 149.40 = 106.60 : x
  2. Step 2: Convert to fraction form
    107.68/149.40 = 106.60/x
  3. Step 3: Cross multiply
    107.68x = 149.40 × 106.60
  4. Step 4: Simplify right side
    107.68x = 15,926.04
  5. Step 5: Solve for x
    x = 15,926.04/107.68
  6. Step 6: Final answer
    x = 147.90

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.