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Finding the Fourth Proportional to 54.28, 74.94 and 39.70

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Solution

The fourth proportional to 54.28, 74.94 and 39.70 is: 54.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.28 : 74.94 = 39.70 : x
  2. Step 2: Convert to fraction form
    54.28/74.94 = 39.70/x
  3. Step 3: Cross multiply
    54.28x = 74.94 × 39.70
  4. Step 4: Simplify right side
    54.28x = 2,975.12
  5. Step 5: Solve for x
    x = 2,975.12/54.28
  6. Step 6: Final answer
    x = 54.81

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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.