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Finding the Fourth Proportional to 18.53, 27.81 and 7.13

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Solution

The fourth proportional to 18.53, 27.81 and 7.13 is: 10.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.53 : 27.81 = 7.13 : x
  2. Step 2: Convert to fraction form
    18.53/27.81 = 7.13/x
  3. Step 3: Cross multiply
    18.53x = 27.81 × 7.13
  4. Step 4: Simplify right side
    18.53x = 198.29
  5. Step 5: Solve for x
    x = 198.29/18.53
  6. Step 6: Final answer
    x = 10.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.