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Finding the Fourth Proportional to 19.20, 26.38 and 17.72

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Solution

The fourth proportional to 19.20, 26.38 and 17.72 is: 24.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.20 : 26.38 = 17.72 : x
  2. Step 2: Convert to fraction form
    19.20/26.38 = 17.72/x
  3. Step 3: Cross multiply
    19.20x = 26.38 × 17.72
  4. Step 4: Simplify right side
    19.20x = 467.34
  5. Step 5: Solve for x
    x = 467.34/19.20
  6. Step 6: Final answer
    x = 24.34

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.