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Finding the Fourth Proportional to 19.92, 27.45 and 18.57

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Solution

The fourth proportional to 19.92, 27.45 and 18.57 is: 25.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.92 : 27.45 = 18.57 : x
  2. Step 2: Convert to fraction form
    19.92/27.45 = 18.57/x
  3. Step 3: Cross multiply
    19.92x = 27.45 × 18.57
  4. Step 4: Simplify right side
    19.92x = 509.75
  5. Step 5: Solve for x
    x = 509.75/19.92
  6. Step 6: Final answer
    x = 25.59

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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.