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Finding the Fourth Proportional to 107.28, 160.61 and 80.15

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Solution

The fourth proportional to 107.28, 160.61 and 80.15 is: 119.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.28 : 160.61 = 80.15 : x
  2. Step 2: Convert to fraction form
    107.28/160.61 = 80.15/x
  3. Step 3: Cross multiply
    107.28x = 160.61 × 80.15
  4. Step 4: Simplify right side
    107.28x = 12,871.69
  5. Step 5: Solve for x
    x = 12,871.69/107.28
  6. Step 6: Final answer
    x = 119.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.