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Finding the Fourth Proportional to 56.92, 85.36 and 28.02

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Solution

The fourth proportional to 56.92, 85.36 and 28.02 is: 42.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.92 : 85.36 = 28.02 : x
  2. Step 2: Convert to fraction form
    56.92/85.36 = 28.02/x
  3. Step 3: Cross multiply
    56.92x = 85.36 × 28.02
  4. Step 4: Simplify right side
    56.92x = 2,391.79
  5. Step 5: Solve for x
    x = 2,391.79/56.92
  6. Step 6: Final answer
    x = 42.02

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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.