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Finding the Third Proportional to 45 and 85.69

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Solution

The third proportional to 45 and 85.69 is: 163.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    45 : 85.69 = 85.69 : x
  2. Step 2: Convert to fraction form
    45/85.69 = 85.69/x
  3. Step 3: Cross multiply
    45x = 85.69 × 85.69
  4. Step 4: Simplify right side
    45x = 7,342.35
  5. Step 5: Solve for x
    x = 7,342.35/45
  6. Step 6: Final answer
    x = 163.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.90) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.