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Finding the Fourth Proportional to 57.66, 86.46 and 19.11

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Solution

The fourth proportional to 57.66, 86.46 and 19.11 is: 28.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.66 : 86.46 = 19.11 : x
  2. Step 2: Convert to fraction form
    57.66/86.46 = 19.11/x
  3. Step 3: Cross multiply
    57.66x = 86.46 × 19.11
  4. Step 4: Simplify right side
    57.66x = 1,652.25
  5. Step 5: Solve for x
    x = 1,652.25/57.66
  6. Step 6: Final answer
    x = 28.66

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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.