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Finding the Fourth Proportional to 38.94, 53.74 and 21.69

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Solution

The fourth proportional to 38.94, 53.74 and 21.69 is: 29.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.94 : 53.74 = 21.69 : x
  2. Step 2: Convert to fraction form
    38.94/53.74 = 21.69/x
  3. Step 3: Cross multiply
    38.94x = 53.74 × 21.69
  4. Step 4: Simplify right side
    38.94x = 1,165.38
  5. Step 5: Solve for x
    x = 1,165.38/38.94
  6. Step 6: Final answer
    x = 29.93

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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.