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Finding the Fourth Proportional to 107.61, 148.58 and 68.85

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Solution

The fourth proportional to 107.61, 148.58 and 68.85 is: 95.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.61 : 148.58 = 68.85 : x
  2. Step 2: Convert to fraction form
    107.61/148.58 = 68.85/x
  3. Step 3: Cross multiply
    107.61x = 148.58 × 68.85
  4. Step 4: Simplify right side
    107.61x = 10,229.39
  5. Step 5: Solve for x
    x = 10,229.39/107.61
  6. Step 6: Final answer
    x = 95.06

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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.