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Finding the Fourth Proportional to 19.17, 26.30 and 18.66

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Solution

The fourth proportional to 19.17, 26.30 and 18.66 is: 25.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.17 : 26.30 = 18.66 : x
  2. Step 2: Convert to fraction form
    19.17/26.30 = 18.66/x
  3. Step 3: Cross multiply
    19.17x = 26.30 × 18.66
  4. Step 4: Simplify right side
    19.17x = 490.80
  5. Step 5: Solve for x
    x = 490.80/19.17
  6. Step 6: Final answer
    x = 25.60

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.