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Finding the Third Proportional to 90 and 197.16

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Solution

The third proportional to 90 and 197.16 is: 431.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    90 : 197.16 = 197.16 : x
  2. Step 2: Convert to fraction form
    90/197.16 = 197.16/x
  3. Step 3: Cross multiply
    90x = 197.16 × 197.16
  4. Step 4: Simplify right side
    90x = 38,870.59
  5. Step 5: Solve for x
    x = 38,870.59/90
  6. Step 6: Final answer
    x = 431.90

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.