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Finding the Fourth Proportional to 11.75, 17.58 and 8.72

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Solution

The fourth proportional to 11.75, 17.58 and 8.72 is: 13.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.75 : 17.58 = 8.72 : x
  2. Step 2: Convert to fraction form
    11.75/17.58 = 8.72/x
  3. Step 3: Cross multiply
    11.75x = 17.58 × 8.72
  4. Step 4: Simplify right side
    11.75x = 153.31
  5. Step 5: Solve for x
    x = 153.31/11.75
  6. Step 6: Final answer
    x = 13.05

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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.