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Finding the Fourth Proportional to 38.74, 53.74 and 36.90

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Solution

The fourth proportional to 38.74, 53.74 and 36.90 is: 51.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.74 : 53.74 = 36.90 : x
  2. Step 2: Convert to fraction form
    38.74/53.74 = 36.90/x
  3. Step 3: Cross multiply
    38.74x = 53.74 × 36.90
  4. Step 4: Simplify right side
    38.74x = 1,983.01
  5. Step 5: Solve for x
    x = 1,983.01/38.74
  6. Step 6: Final answer
    x = 51.19

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.