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Finding the Fourth Proportional to 57.49, 85.81 and 53.48

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Solution

The fourth proportional to 57.49, 85.81 and 53.48 is: 79.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.49 : 85.81 = 53.48 : x
  2. Step 2: Convert to fraction form
    57.49/85.81 = 53.48/x
  3. Step 3: Cross multiply
    57.49x = 85.81 × 53.48
  4. Step 4: Simplify right side
    57.49x = 4,589.59
  5. Step 5: Solve for x
    x = 4,589.59/57.49
  6. Step 6: Final answer
    x = 79.83

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.