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Finding the Fourth Proportional to 18.90, 28.38 and 17.99

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Solution

The fourth proportional to 18.90, 28.38 and 17.99 is: 27.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.90 : 28.38 = 17.99 : x
  2. Step 2: Convert to fraction form
    18.90/28.38 = 17.99/x
  3. Step 3: Cross multiply
    18.90x = 28.38 × 17.99
  4. Step 4: Simplify right side
    18.90x = 510.59
  5. Step 5: Solve for x
    x = 510.59/18.90
  6. Step 6: Final answer
    x = 27.02

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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.