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Finding the Fourth Proportional to 18.40, 27.60 and 17.28

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Solution

The fourth proportional to 18.40, 27.60 and 17.28 is: 25.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.40 : 27.60 = 17.28 : x
  2. Step 2: Convert to fraction form
    18.40/27.60 = 17.28/x
  3. Step 3: Cross multiply
    18.40x = 27.60 × 17.28
  4. Step 4: Simplify right side
    18.40x = 476.93
  5. Step 5: Solve for x
    x = 476.93/18.40
  6. Step 6: Final answer
    x = 25.92

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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.