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Finding the Fourth Proportional to 71.09, 106.52 and 36.80

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Solution

The fourth proportional to 71.09, 106.52 and 36.80 is: 55.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.09 : 106.52 = 36.80 : x
  2. Step 2: Convert to fraction form
    71.09/106.52 = 36.80/x
  3. Step 3: Cross multiply
    71.09x = 106.52 × 36.80
  4. Step 4: Simplify right side
    71.09x = 3,919.94
  5. Step 5: Solve for x
    x = 3,919.94/71.09
  6. Step 6: Final answer
    x = 55.14

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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.