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Finding the Fourth Proportional to 39.51, 54.54 and 27.87

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Solution

The fourth proportional to 39.51, 54.54 and 27.87 is: 38.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.51 : 54.54 = 27.87 : x
  2. Step 2: Convert to fraction form
    39.51/54.54 = 27.87/x
  3. Step 3: Cross multiply
    39.51x = 54.54 × 27.87
  4. Step 4: Simplify right side
    39.51x = 1,520.03
  5. Step 5: Solve for x
    x = 1,520.03/39.51
  6. Step 6: Final answer
    x = 38.47

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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.