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Finding the Fourth Proportional to 39.33, 54.31 and 30.60

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Solution

The fourth proportional to 39.33, 54.31 and 30.60 is: 42.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.33 : 54.31 = 30.60 : x
  2. Step 2: Convert to fraction form
    39.33/54.31 = 30.60/x
  3. Step 3: Cross multiply
    39.33x = 54.31 × 30.60
  4. Step 4: Simplify right side
    39.33x = 1,661.89
  5. Step 5: Solve for x
    x = 1,661.89/39.33
  6. Step 6: Final answer
    x = 42.25

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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.