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Finding the Fourth Proportional to 39.86, 54.99 and 25.30

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Solution

The fourth proportional to 39.86, 54.99 and 25.30 is: 34.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.86 : 54.99 = 25.30 : x
  2. Step 2: Convert to fraction form
    39.86/54.99 = 25.30/x
  3. Step 3: Cross multiply
    39.86x = 54.99 × 25.30
  4. Step 4: Simplify right side
    39.86x = 1,391.11
  5. Step 5: Solve for x
    x = 1,391.11/39.86
  6. Step 6: Final answer
    x = 34.90

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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.