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Finding the Fourth Proportional to 107.81, 148.79 and 69

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Solution

The fourth proportional to 107.81, 148.79 and 69 is: 95.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.81 : 148.79 = 69 : x
  2. Step 2: Convert to fraction form
    107.81/148.79 = 69/x
  3. Step 3: Cross multiply
    107.81x = 148.79 × 69
  4. Step 4: Simplify right side
    107.81x = 10,266.17
  5. Step 5: Solve for x
    x = 10,266.17/107.81
  6. Step 6: Final answer
    x = 95.22

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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.