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Finding the Fourth Proportional to 18.71, 27.72 and 18.51

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Solution

The fourth proportional to 18.71, 27.72 and 18.51 is: 27.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.71 : 27.72 = 18.51 : x
  2. Step 2: Convert to fraction form
    18.71/27.72 = 18.51/x
  3. Step 3: Cross multiply
    18.71x = 27.72 × 18.51
  4. Step 4: Simplify right side
    18.71x = 513.10
  5. Step 5: Solve for x
    x = 513.10/18.71
  6. Step 6: Final answer
    x = 27.42

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.