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Finding the Fourth Proportional to 4.55, 6.86 and 4.12

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Solution

The fourth proportional to 4.55, 6.86 and 4.12 is: 6.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.55 : 6.86 = 4.12 : x
  2. Step 2: Convert to fraction form
    4.55/6.86 = 4.12/x
  3. Step 3: Cross multiply
    4.55x = 6.86 × 4.12
  4. Step 4: Simplify right side
    4.55x = 28.26
  5. Step 5: Solve for x
    x = 28.26/4.55
  6. Step 6: Final answer
    x = 6.21

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.