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Finding the Fourth Proportional to 57.06, 85.47 and 28.50

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Solution

The fourth proportional to 57.06, 85.47 and 28.50 is: 42.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.06 : 85.47 = 28.50 : x
  2. Step 2: Convert to fraction form
    57.06/85.47 = 28.50/x
  3. Step 3: Cross multiply
    57.06x = 85.47 × 28.50
  4. Step 4: Simplify right side
    57.06x = 2,435.90
  5. Step 5: Solve for x
    x = 2,435.90/57.06
  6. Step 6: Final answer
    x = 42.69

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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.