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Finding the Fourth Proportional to 18.69, 25.71 and 15.59

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Solution

The fourth proportional to 18.69, 25.71 and 15.59 is: 21.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.69 : 25.71 = 15.59 : x
  2. Step 2: Convert to fraction form
    18.69/25.71 = 15.59/x
  3. Step 3: Cross multiply
    18.69x = 25.71 × 15.59
  4. Step 4: Simplify right side
    18.69x = 400.82
  5. Step 5: Solve for x
    x = 400.82/18.69
  6. Step 6: Final answer
    x = 21.45

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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.