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Finding the Fourth Proportional to 39.99, 55.18 and 38.22

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Solution

The fourth proportional to 39.99, 55.18 and 38.22 is: 52.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.99 : 55.18 = 38.22 : x
  2. Step 2: Convert to fraction form
    39.99/55.18 = 38.22/x
  3. Step 3: Cross multiply
    39.99x = 55.18 × 38.22
  4. Step 4: Simplify right side
    39.99x = 2,109.13
  5. Step 5: Solve for x
    x = 2,109.13/39.99
  6. Step 6: Final answer
    x = 52.74

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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.