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Finding the Fourth Proportional to 19.88, 29.97 and 17.66

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Solution

The fourth proportional to 19.88, 29.97 and 17.66 is: 26.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.88 : 29.97 = 17.66 : x
  2. Step 2: Convert to fraction form
    19.88/29.97 = 17.66/x
  3. Step 3: Cross multiply
    19.88x = 29.97 × 17.66
  4. Step 4: Simplify right side
    19.88x = 529.12
  5. Step 5: Solve for x
    x = 529.12/19.88
  6. Step 6: Final answer
    x = 26.62

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.