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Finding the Fourth Proportional to 57.66, 86.53 and 57.21

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Solution

The fourth proportional to 57.66, 86.53 and 57.21 is: 85.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.66 : 86.53 = 57.21 : x
  2. Step 2: Convert to fraction form
    57.66/86.53 = 57.21/x
  3. Step 3: Cross multiply
    57.66x = 86.53 × 57.21
  4. Step 4: Simplify right side
    57.66x = 4,950.38
  5. Step 5: Solve for x
    x = 4,950.38/57.66
  6. Step 6: Final answer
    x = 85.85

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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.