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Finding the Fourth Proportional to 19.79, 27.24 and 15.87

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Solution

The fourth proportional to 19.79, 27.24 and 15.87 is: 21.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.79 : 27.24 = 15.87 : x
  2. Step 2: Convert to fraction form
    19.79/27.24 = 15.87/x
  3. Step 3: Cross multiply
    19.79x = 27.24 × 15.87
  4. Step 4: Simplify right side
    19.79x = 432.40
  5. Step 5: Solve for x
    x = 432.40/19.79
  6. Step 6: Final answer
    x = 21.85

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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.