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Finding the Fourth Proportional to 27.78, 38.31 and 19.59

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Solution

The fourth proportional to 27.78, 38.31 and 19.59 is: 27.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.78 : 38.31 = 19.59 : x
  2. Step 2: Convert to fraction form
    27.78/38.31 = 19.59/x
  3. Step 3: Cross multiply
    27.78x = 38.31 × 19.59
  4. Step 4: Simplify right side
    27.78x = 750.49
  5. Step 5: Solve for x
    x = 750.49/27.78
  6. Step 6: Final answer
    x = 27.02

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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.