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Finding the Fourth Proportional to 57.09, 78.75 and 53.85

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Solution

The fourth proportional to 57.09, 78.75 and 53.85 is: 74.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.09 : 78.75 = 53.85 : x
  2. Step 2: Convert to fraction form
    57.09/78.75 = 53.85/x
  3. Step 3: Cross multiply
    57.09x = 78.75 × 53.85
  4. Step 4: Simplify right side
    57.09x = 4,240.69
  5. Step 5: Solve for x
    x = 4,240.69/57.09
  6. Step 6: Final answer
    x = 74.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.