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Finding the Fourth Proportional to 39.13, 54.00 and 21.65

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Solution

The fourth proportional to 39.13, 54.00 and 21.65 is: 29.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.13 : 54.00 = 21.65 : x
  2. Step 2: Convert to fraction form
    39.13/54.00 = 21.65/x
  3. Step 3: Cross multiply
    39.13x = 54.00 × 21.65
  4. Step 4: Simplify right side
    39.13x = 1,168.72
  5. Step 5: Solve for x
    x = 1,168.72/39.13
  6. Step 6: Final answer
    x = 29.87

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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.