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Finding the Fourth Proportional to 56.72, 85 and 42.25

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Solution

The fourth proportional to 56.72, 85 and 42.25 is: 63.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.72 : 85 = 42.25 : x
  2. Step 2: Convert to fraction form
    56.72/85 = 42.25/x
  3. Step 3: Cross multiply
    56.72x = 85 × 42.25
  4. Step 4: Simplify right side
    56.72x = 3,591.25
  5. Step 5: Solve for x
    x = 3,591.25/56.72
  6. Step 6: Final answer
    x = 63.32

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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.