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Finding the Fourth Proportional to 17.79, 24.57 and 15.78

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Solution

The fourth proportional to 17.79, 24.57 and 15.78 is: 21.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.79 : 24.57 = 15.78 : x
  2. Step 2: Convert to fraction form
    17.79/24.57 = 15.78/x
  3. Step 3: Cross multiply
    17.79x = 24.57 × 15.78
  4. Step 4: Simplify right side
    17.79x = 387.71
  5. Step 5: Solve for x
    x = 387.71/17.79
  6. Step 6: Final answer
    x = 21.79

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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.