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Finding the Fourth Proportional to 4.47, 6.17 and 4.21

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Solution

The fourth proportional to 4.47, 6.17 and 4.21 is: 5.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.47 : 6.17 = 4.21 : x
  2. Step 2: Convert to fraction form
    4.47/6.17 = 4.21/x
  3. Step 3: Cross multiply
    4.47x = 6.17 × 4.21
  4. Step 4: Simplify right side
    4.47x = 25.98
  5. Step 5: Solve for x
    x = 25.98/4.47
  6. Step 6: Final answer
    x = 5.81

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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.