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Finding the Fourth Proportional to 8.70, 12 and 6.12

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Solution

The fourth proportional to 8.70, 12 and 6.12 is: 8.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.70 : 12 = 6.12 : x
  2. Step 2: Convert to fraction form
    8.70/12 = 6.12/x
  3. Step 3: Cross multiply
    8.70x = 12 × 6.12
  4. Step 4: Simplify right side
    8.70x = 73.38
  5. Step 5: Solve for x
    x = 73.38/8.70
  6. Step 6: Final answer
    x = 8.43

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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.