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Finding the Fourth Proportional to 17.55, 24.30 and 15.75

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Solution

The fourth proportional to 17.55, 24.30 and 15.75 is: 21.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.55 : 24.30 = 15.75 : x
  2. Step 2: Convert to fraction form
    17.55/24.30 = 15.75/x
  3. Step 3: Cross multiply
    17.55x = 24.30 × 15.75
  4. Step 4: Simplify right side
    17.55x = 382.73
  5. Step 5: Solve for x
    x = 382.73/17.55
  6. Step 6: Final answer
    x = 21.81

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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.