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Finding the Fourth Proportional to 21.50, 31.92 and 21.14

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Solution

The fourth proportional to 21.50, 31.92 and 21.14 is: 31.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.50 : 31.92 = 21.14 : x
  2. Step 2: Convert to fraction form
    21.50/31.92 = 21.14/x
  3. Step 3: Cross multiply
    21.50x = 31.92 × 21.14
  4. Step 4: Simplify right side
    21.50x = 674.79
  5. Step 5: Solve for x
    x = 674.79/21.50
  6. Step 6: Final answer
    x = 31.39

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.