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Finding the Third Proportional to 61.70 and 90.65

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Solution

The third proportional to 61.70 and 90.65 is: 133.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.70 : 90.65 = 90.65 : x
  2. Step 2: Convert to fraction form
    61.70/90.65 = 90.65/x
  3. Step 3: Cross multiply
    61.70x = 90.65 × 90.65
  4. Step 4: Simplify right side
    61.70x = 8,217.49
  5. Step 5: Solve for x
    x = 8,217.49/61.70
  6. Step 6: Final answer
    x = 133.19

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.