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Finding the Fourth Proportional to 11.45, 17.15 and 7.88

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Solution

The fourth proportional to 11.45, 17.15 and 7.88 is: 11.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.45 : 17.15 = 7.88 : x
  2. Step 2: Convert to fraction form
    11.45/17.15 = 7.88/x
  3. Step 3: Cross multiply
    11.45x = 17.15 × 7.88
  4. Step 4: Simplify right side
    11.45x = 135.06
  5. Step 5: Solve for x
    x = 135.06/11.45
  6. Step 6: Final answer
    x = 11.80

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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.