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Finding the Fourth Proportional to 38.81, 53.54 and 34.66

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Solution

The fourth proportional to 38.81, 53.54 and 34.66 is: 47.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.81 : 53.54 = 34.66 : x
  2. Step 2: Convert to fraction form
    38.81/53.54 = 34.66/x
  3. Step 3: Cross multiply
    38.81x = 53.54 × 34.66
  4. Step 4: Simplify right side
    38.81x = 1,855.43
  5. Step 5: Solve for x
    x = 1,855.43/38.81
  6. Step 6: Final answer
    x = 47.81

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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.