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Finding the Fourth Proportional to 11.88, 16.40 and 7.28

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Solution

The fourth proportional to 11.88, 16.40 and 7.28 is: 10.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.88 : 16.40 = 7.28 : x
  2. Step 2: Convert to fraction form
    11.88/16.40 = 7.28/x
  3. Step 3: Cross multiply
    11.88x = 16.40 × 7.28
  4. Step 4: Simplify right side
    11.88x = 119.41
  5. Step 5: Solve for x
    x = 119.41/11.88
  6. Step 6: Final answer
    x = 10.05

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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.