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Finding the Fourth Proportional to 57.12, 85.47 and 43.49

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Solution

The fourth proportional to 57.12, 85.47 and 43.49 is: 65.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.12 : 85.47 = 43.49 : x
  2. Step 2: Convert to fraction form
    57.12/85.47 = 43.49/x
  3. Step 3: Cross multiply
    57.12x = 85.47 × 43.49
  4. Step 4: Simplify right side
    57.12x = 3,716.66
  5. Step 5: Solve for x
    x = 3,716.66/57.12
  6. Step 6: Final answer
    x = 65.07

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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.