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Finding the Fourth Proportional to 34.19, 47.14 and 21.89

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Solution

The fourth proportional to 34.19, 47.14 and 21.89 is: 30.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.19 : 47.14 = 21.89 : x
  2. Step 2: Convert to fraction form
    34.19/47.14 = 21.89/x
  3. Step 3: Cross multiply
    34.19x = 47.14 × 21.89
  4. Step 4: Simplify right side
    34.19x = 1,031.89
  5. Step 5: Solve for x
    x = 1,031.89/34.19
  6. Step 6: Final answer
    x = 30.18

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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.