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Finding the Fourth Proportional to 57.96, 86.99 and 45.18

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Solution

The fourth proportional to 57.96, 86.99 and 45.18 is: 67.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.96 : 86.99 = 45.18 : x
  2. Step 2: Convert to fraction form
    57.96/86.99 = 45.18/x
  3. Step 3: Cross multiply
    57.96x = 86.99 × 45.18
  4. Step 4: Simplify right side
    57.96x = 3,929.98
  5. Step 5: Solve for x
    x = 3,929.98/57.96
  6. Step 6: Final answer
    x = 67.81

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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.