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Finding the Fourth Proportional to 57.98, 86.97 and 21.90

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Solution

The fourth proportional to 57.98, 86.97 and 21.90 is: 32.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.98 : 86.97 = 21.90 : x
  2. Step 2: Convert to fraction form
    57.98/86.97 = 21.90/x
  3. Step 3: Cross multiply
    57.98x = 86.97 × 21.90
  4. Step 4: Simplify right side
    57.98x = 1,904.21
  5. Step 5: Solve for x
    x = 1,904.21/57.98
  6. Step 6: Final answer
    x = 32.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.