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Finding the Fourth Proportional to 19.66, 29.32 and 18.65

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Solution

The fourth proportional to 19.66, 29.32 and 18.65 is: 27.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.66 : 29.32 = 18.65 : x
  2. Step 2: Convert to fraction form
    19.66/29.32 = 18.65/x
  3. Step 3: Cross multiply
    19.66x = 29.32 × 18.65
  4. Step 4: Simplify right side
    19.66x = 546.82
  5. Step 5: Solve for x
    x = 546.82/19.66
  6. Step 6: Final answer
    x = 27.81

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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.