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Finding the Fourth Proportional to 17.61, 26.40 and 13.62

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Solution

The fourth proportional to 17.61, 26.40 and 13.62 is: 20.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.61 : 26.40 = 13.62 : x
  2. Step 2: Convert to fraction form
    17.61/26.40 = 13.62/x
  3. Step 3: Cross multiply
    17.61x = 26.40 × 13.62
  4. Step 4: Simplify right side
    17.61x = 359.57
  5. Step 5: Solve for x
    x = 359.57/17.61
  6. Step 6: Final answer
    x = 20.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.