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Finding the Fourth Proportional to 106.80, 160.40 and 91.41

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Solution

The fourth proportional to 106.80, 160.40 and 91.41 is: 137.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.80 : 160.40 = 91.41 : x
  2. Step 2: Convert to fraction form
    106.80/160.40 = 91.41/x
  3. Step 3: Cross multiply
    106.80x = 160.40 × 91.41
  4. Step 4: Simplify right side
    106.80x = 14,661.28
  5. Step 5: Solve for x
    x = 14,661.28/106.80
  6. Step 6: Final answer
    x = 137.28

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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.