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Finding the Fourth Proportional to 19.14, 26.34 and 15.90

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Solution

The fourth proportional to 19.14, 26.34 and 15.90 is: 21.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.14 : 26.34 = 15.90 : x
  2. Step 2: Convert to fraction form
    19.14/26.34 = 15.90/x
  3. Step 3: Cross multiply
    19.14x = 26.34 × 15.90
  4. Step 4: Simplify right side
    19.14x = 418.81
  5. Step 5: Solve for x
    x = 418.81/19.14
  6. Step 6: Final answer
    x = 21.88

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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.