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Finding the Fourth Proportional to 11.49, 15.78 and 10.91

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Solution

The fourth proportional to 11.49, 15.78 and 10.91 is: 14.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.49 : 15.78 = 10.91 : x
  2. Step 2: Convert to fraction form
    11.49/15.78 = 10.91/x
  3. Step 3: Cross multiply
    11.49x = 15.78 × 10.91
  4. Step 4: Simplify right side
    11.49x = 172.08
  5. Step 5: Solve for x
    x = 172.08/11.49
  6. Step 6: Final answer
    x = 14.98

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.