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Finding the Third Proportional to 561.94 and 645.19

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Solution

The third proportional to 561.94 and 645.19 is: 740.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.94 : 645.19 = 645.19 : x
  2. Step 2: Convert to fraction form
    561.94/645.19 = 645.19/x
  3. Step 3: Cross multiply
    561.94x = 645.19 × 645.19
  4. Step 4: Simplify right side
    561.94x = 416,266.91
  5. Step 5: Solve for x
    x = 416,266.91/561.94
  6. Step 6: Final answer
    x = 740.77

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.