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Finding the Fourth Proportional to 19.98, 29.90 and 11.40

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Solution

The fourth proportional to 19.98, 29.90 and 11.40 is: 17.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.98 : 29.90 = 11.40 : x
  2. Step 2: Convert to fraction form
    19.98/29.90 = 11.40/x
  3. Step 3: Cross multiply
    19.98x = 29.90 × 11.40
  4. Step 4: Simplify right side
    19.98x = 340.80
  5. Step 5: Solve for x
    x = 340.80/19.98
  6. Step 6: Final answer
    x = 17.06

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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.