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Finding the Fourth Proportional to 39.04, 53.84 and 28.12

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Solution

The fourth proportional to 39.04, 53.84 and 28.12 is: 38.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.04 : 53.84 = 28.12 : x
  2. Step 2: Convert to fraction form
    39.04/53.84 = 28.12/x
  3. Step 3: Cross multiply
    39.04x = 53.84 × 28.12
  4. Step 4: Simplify right side
    39.04x = 1,513.98
  5. Step 5: Solve for x
    x = 1,513.98/39.04
  6. Step 6: Final answer
    x = 38.78

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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.