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Finding the Fourth Proportional to 107.20, 160.95 and 66.81

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Solution

The fourth proportional to 107.20, 160.95 and 66.81 is: 100.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.20 : 160.95 = 66.81 : x
  2. Step 2: Convert to fraction form
    107.20/160.95 = 66.81/x
  3. Step 3: Cross multiply
    107.20x = 160.95 × 66.81
  4. Step 4: Simplify right side
    107.20x = 10,753.07
  5. Step 5: Solve for x
    x = 10,753.07/107.20
  6. Step 6: Final answer
    x = 100.31

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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.