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Finding the Fourth Proportional to 39.79, 54.90 and 25.95

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Solution

The fourth proportional to 39.79, 54.90 and 25.95 is: 35.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.79 : 54.90 = 25.95 : x
  2. Step 2: Convert to fraction form
    39.79/54.90 = 25.95/x
  3. Step 3: Cross multiply
    39.79x = 54.90 × 25.95
  4. Step 4: Simplify right side
    39.79x = 1,424.66
  5. Step 5: Solve for x
    x = 1,424.66/39.79
  6. Step 6: Final answer
    x = 35.80

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.