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Finding the Fourth Proportional to 18.90, 26.03 and 18.87

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Solution

The fourth proportional to 18.90, 26.03 and 18.87 is: 25.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.90 : 26.03 = 18.87 : x
  2. Step 2: Convert to fraction form
    18.90/26.03 = 18.87/x
  3. Step 3: Cross multiply
    18.90x = 26.03 × 18.87
  4. Step 4: Simplify right side
    18.90x = 491.09
  5. Step 5: Solve for x
    x = 491.09/18.90
  6. Step 6: Final answer
    x = 25.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.