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Finding the Fourth Proportional to 38.69, 53.31 and 37.85

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Solution

The fourth proportional to 38.69, 53.31 and 37.85 is: 52.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.69 : 53.31 = 37.85 : x
  2. Step 2: Convert to fraction form
    38.69/53.31 = 37.85/x
  3. Step 3: Cross multiply
    38.69x = 53.31 × 37.85
  4. Step 4: Simplify right side
    38.69x = 2,017.52
  5. Step 5: Solve for x
    x = 2,017.52/38.69
  6. Step 6: Final answer
    x = 52.15

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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.