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Finding the Fourth Proportional to 107.81, 148.74 and 66.39

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Solution

The fourth proportional to 107.81, 148.74 and 66.39 is: 91.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.81 : 148.74 = 66.39 : x
  2. Step 2: Convert to fraction form
    107.81/148.74 = 66.39/x
  3. Step 3: Cross multiply
    107.81x = 148.74 × 66.39
  4. Step 4: Simplify right side
    107.81x = 9,874.85
  5. Step 5: Solve for x
    x = 9,874.85/107.81
  6. Step 6: Final answer
    x = 91.60

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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.