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Finding the Fourth Proportional to 39.85, 55.16 and 36.61

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Solution

The fourth proportional to 39.85, 55.16 and 36.61 is: 50.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.85 : 55.16 = 36.61 : x
  2. Step 2: Convert to fraction form
    39.85/55.16 = 36.61/x
  3. Step 3: Cross multiply
    39.85x = 55.16 × 36.61
  4. Step 4: Simplify right side
    39.85x = 2,019.41
  5. Step 5: Solve for x
    x = 2,019.41/39.85
  6. Step 6: Final answer
    x = 50.68

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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.