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Finding the Fourth Proportional to 8.12, 11.21 and 6.30

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Solution

The fourth proportional to 8.12, 11.21 and 6.30 is: 8.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.12 : 11.21 = 6.30 : x
  2. Step 2: Convert to fraction form
    8.12/11.21 = 6.30/x
  3. Step 3: Cross multiply
    8.12x = 11.21 × 6.30
  4. Step 4: Simplify right side
    8.12x = 70.59
  5. Step 5: Solve for x
    x = 70.59/8.12
  6. Step 6: Final answer
    x = 8.70

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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.