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Finding the Fourth Proportional to 57.96, 86.88 and 55.38

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Solution

The fourth proportional to 57.96, 86.88 and 55.38 is: 83.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.96 : 86.88 = 55.38 : x
  2. Step 2: Convert to fraction form
    57.96/86.88 = 55.38/x
  3. Step 3: Cross multiply
    57.96x = 86.88 × 55.38
  4. Step 4: Simplify right side
    57.96x = 4,811.41
  5. Step 5: Solve for x
    x = 4,811.41/57.96
  6. Step 6: Final answer
    x = 83.01

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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.