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Finding the Fourth Proportional to 19.80, 29.54 and 18.09

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Solution

The fourth proportional to 19.80, 29.54 and 18.09 is: 26.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.80 : 29.54 = 18.09 : x
  2. Step 2: Convert to fraction form
    19.80/29.54 = 18.09/x
  3. Step 3: Cross multiply
    19.80x = 29.54 × 18.09
  4. Step 4: Simplify right side
    19.80x = 534.29
  5. Step 5: Solve for x
    x = 534.29/19.80
  6. Step 6: Final answer
    x = 26.98

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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.