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Finding the Fourth Proportional to 8.26, 12.40 and 7.40

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Solution

The fourth proportional to 8.26, 12.40 and 7.40 is: 11.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.26 : 12.40 = 7.40 : x
  2. Step 2: Convert to fraction form
    8.26/12.40 = 7.40/x
  3. Step 3: Cross multiply
    8.26x = 12.40 × 7.40
  4. Step 4: Simplify right side
    8.26x = 91.76
  5. Step 5: Solve for x
    x = 91.76/8.26
  6. Step 6: Final answer
    x = 11.11

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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.