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Finding the Fourth Proportional to 19.07, 26.28 and 15.39

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Solution

The fourth proportional to 19.07, 26.28 and 15.39 is: 21.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.07 : 26.28 = 15.39 : x
  2. Step 2: Convert to fraction form
    19.07/26.28 = 15.39/x
  3. Step 3: Cross multiply
    19.07x = 26.28 × 15.39
  4. Step 4: Simplify right side
    19.07x = 404.35
  5. Step 5: Solve for x
    x = 404.35/19.07
  6. Step 6: Final answer
    x = 21.21

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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.