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Finding the Fourth Proportional to 11.49, 15.86 and 7.40

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Solution

The fourth proportional to 11.49, 15.86 and 7.40 is: 10.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.49 : 15.86 = 7.40 : x
  2. Step 2: Convert to fraction form
    11.49/15.86 = 7.40/x
  3. Step 3: Cross multiply
    11.49x = 15.86 × 7.40
  4. Step 4: Simplify right side
    11.49x = 117.37
  5. Step 5: Solve for x
    x = 117.37/11.49
  6. Step 6: Final answer
    x = 10.21

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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.