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Finding the Fourth Proportional to 21.85, 32.50 and 21.37

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Solution

The fourth proportional to 21.85, 32.50 and 21.37 is: 31.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.85 : 32.50 = 21.37 : x
  2. Step 2: Convert to fraction form
    21.85/32.50 = 21.37/x
  3. Step 3: Cross multiply
    21.85x = 32.50 × 21.37
  4. Step 4: Simplify right side
    21.85x = 694.53
  5. Step 5: Solve for x
    x = 694.53/21.85
  6. Step 6: Final answer
    x = 31.79

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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.