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Finding the Fourth Proportional to 8.19, 11.16 and 8.15

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Solution

The fourth proportional to 8.19, 11.16 and 8.15 is: 11.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.19 : 11.16 = 8.15 : x
  2. Step 2: Convert to fraction form
    8.19/11.16 = 8.15/x
  3. Step 3: Cross multiply
    8.19x = 11.16 × 8.15
  4. Step 4: Simplify right side
    8.19x = 90.90
  5. Step 5: Solve for x
    x = 90.90/8.19
  6. Step 6: Final answer
    x = 11.10

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.