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Finding the Fourth Proportional to 39.14, 53.90 and 34.74

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Solution

The fourth proportional to 39.14, 53.90 and 34.74 is: 47.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.14 : 53.90 = 34.74 : x
  2. Step 2: Convert to fraction form
    39.14/53.90 = 34.74/x
  3. Step 3: Cross multiply
    39.14x = 53.90 × 34.74
  4. Step 4: Simplify right side
    39.14x = 1,872.31
  5. Step 5: Solve for x
    x = 1,872.31/39.14
  6. Step 6: Final answer
    x = 47.84

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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.