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Finding the Fourth Proportional to 18.65, 27.84 and 16.40

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Solution

The fourth proportional to 18.65, 27.84 and 16.40 is: 24.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.65 : 27.84 = 16.40 : x
  2. Step 2: Convert to fraction form
    18.65/27.84 = 16.40/x
  3. Step 3: Cross multiply
    18.65x = 27.84 × 16.40
  4. Step 4: Simplify right side
    18.65x = 456.58
  5. Step 5: Solve for x
    x = 456.58/18.65
  6. Step 6: Final answer
    x = 24.48

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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.