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Finding the Fourth Proportional to 19.71, 29.38 and 18.19

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Solution

The fourth proportional to 19.71, 29.38 and 18.19 is: 27.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.71 : 29.38 = 18.19 : x
  2. Step 2: Convert to fraction form
    19.71/29.38 = 18.19/x
  3. Step 3: Cross multiply
    19.71x = 29.38 × 18.19
  4. Step 4: Simplify right side
    19.71x = 534.45
  5. Step 5: Solve for x
    x = 534.45/19.71
  6. Step 6: Final answer
    x = 27.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.