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Finding the Fourth Proportional to 4.47, 6.67 and 4.21

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Solution

The fourth proportional to 4.47, 6.67 and 4.21 is: 6.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.47 : 6.67 = 4.21 : x
  2. Step 2: Convert to fraction form
    4.47/6.67 = 4.21/x
  3. Step 3: Cross multiply
    4.47x = 6.67 × 4.21
  4. Step 4: Simplify right side
    4.47x = 28.08
  5. Step 5: Solve for x
    x = 28.08/4.47
  6. Step 6: Final answer
    x = 6.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.