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Finding the Fourth Proportional to 19.92, 27.48 and 15.78

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Solution

The fourth proportional to 19.92, 27.48 and 15.78 is: 21.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.92 : 27.48 = 15.78 : x
  2. Step 2: Convert to fraction form
    19.92/27.48 = 15.78/x
  3. Step 3: Cross multiply
    19.92x = 27.48 × 15.78
  4. Step 4: Simplify right side
    19.92x = 433.63
  5. Step 5: Solve for x
    x = 433.63/19.92
  6. Step 6: Final answer
    x = 21.77

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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.