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Finding the Fourth Proportional to 39.94, 55 and 28.28

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Solution

The fourth proportional to 39.94, 55 and 28.28 is: 38.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.94 : 55 = 28.28 : x
  2. Step 2: Convert to fraction form
    39.94/55 = 28.28/x
  3. Step 3: Cross multiply
    39.94x = 55 × 28.28
  4. Step 4: Simplify right side
    39.94x = 1,555.40
  5. Step 5: Solve for x
    x = 1,555.40/39.94
  6. Step 6: Final answer
    x = 38.94

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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.