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Finding the Third Proportional to 91.31 and 211.13

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Solution

The third proportional to 91.31 and 211.13 is: 488.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.31 : 211.13 = 211.13 : x
  2. Step 2: Convert to fraction form
    91.31/211.13 = 211.13/x
  3. Step 3: Cross multiply
    91.31x = 211.13 × 211.13
  4. Step 4: Simplify right side
    91.31x = 44,573.77
  5. Step 5: Solve for x
    x = 44,573.77/91.31
  6. Step 6: Final answer
    x = 488.15

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Why These Related Problems?

These problems maintain the same ratio (2.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.