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Finding the Fourth Proportional to 36, 49.55 and 31.91

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Solution

The fourth proportional to 36, 49.55 and 31.91 is: 43.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    36 : 49.55 = 31.91 : x
  2. Step 2: Convert to fraction form
    36/49.55 = 31.91/x
  3. Step 3: Cross multiply
    36x = 49.55 × 31.91
  4. Step 4: Simplify right side
    36x = 1,580.73
  5. Step 5: Solve for x
    x = 1,580.73/36
  6. Step 6: Final answer
    x = 43.91

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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.