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Finding the Fourth Proportional to 39.89, 54.91 and 39.83

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Solution

The fourth proportional to 39.89, 54.91 and 39.83 is: 54.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.89 : 54.91 = 39.83 : x
  2. Step 2: Convert to fraction form
    39.89/54.91 = 39.83/x
  3. Step 3: Cross multiply
    39.89x = 54.91 × 39.83
  4. Step 4: Simplify right side
    39.89x = 2,186.84
  5. Step 5: Solve for x
    x = 2,186.84/39.89
  6. Step 6: Final answer
    x = 54.82

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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.