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Finding the Fourth Proportional to 34.21, 47.21 and 19.66

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Solution

The fourth proportional to 34.21, 47.21 and 19.66 is: 27.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.21 : 47.21 = 19.66 : x
  2. Step 2: Convert to fraction form
    34.21/47.21 = 19.66/x
  3. Step 3: Cross multiply
    34.21x = 47.21 × 19.66
  4. Step 4: Simplify right side
    34.21x = 927.81
  5. Step 5: Solve for x
    x = 927.81/34.21
  6. Step 6: Final answer
    x = 27.13

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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.