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Finding the Third Proportional to 57.19 and 90.42

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Solution

The third proportional to 57.19 and 90.42 is: 142.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.19 : 90.42 = 90.42 : x
  2. Step 2: Convert to fraction form
    57.19/90.42 = 90.42/x
  3. Step 3: Cross multiply
    57.19x = 90.42 × 90.42
  4. Step 4: Simplify right side
    57.19x = 8,176.12
  5. Step 5: Solve for x
    x = 8,176.12/57.19
  6. Step 6: Final answer
    x = 142.97

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.