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Finding the Fourth Proportional to 19.20, 26.47 and 15.55

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Solution

The fourth proportional to 19.20, 26.47 and 15.55 is: 21.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.20 : 26.47 = 15.55 : x
  2. Step 2: Convert to fraction form
    19.20/26.47 = 15.55/x
  3. Step 3: Cross multiply
    19.20x = 26.47 × 15.55
  4. Step 4: Simplify right side
    19.20x = 411.61
  5. Step 5: Solve for x
    x = 411.61/19.20
  6. Step 6: Final answer
    x = 21.44

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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.