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Finding the Fourth Proportional to 6.21, 8.60 and 6.12

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Solution

The fourth proportional to 6.21, 8.60 and 6.12 is: 8.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.21 : 8.60 = 6.12 : x
  2. Step 2: Convert to fraction form
    6.21/8.60 = 6.12/x
  3. Step 3: Cross multiply
    6.21x = 8.60 × 6.12
  4. Step 4: Simplify right side
    6.21x = 52.60
  5. Step 5: Solve for x
    x = 52.60/6.21
  6. Step 6: Final answer
    x = 8.47

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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.