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Finding the Fourth Proportional to 18.64, 27.81 and 15.76

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Solution

The fourth proportional to 18.64, 27.81 and 15.76 is: 23.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.64 : 27.81 = 15.76 : x
  2. Step 2: Convert to fraction form
    18.64/27.81 = 15.76/x
  3. Step 3: Cross multiply
    18.64x = 27.81 × 15.76
  4. Step 4: Simplify right side
    18.64x = 438.29
  5. Step 5: Solve for x
    x = 438.29/18.64
  6. Step 6: Final answer
    x = 23.51

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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.