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Finding the Third Proportional to 661.50 and 870.19

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Solution

The third proportional to 661.50 and 870.19 is: 1,144.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.50 : 870.19 = 870.19 : x
  2. Step 2: Convert to fraction form
    661.50/870.19 = 870.19/x
  3. Step 3: Cross multiply
    661.50x = 870.19 × 870.19
  4. Step 4: Simplify right side
    661.50x = 757,226.29
  5. Step 5: Solve for x
    x = 757,226.29/661.50
  6. Step 6: Final answer
    x = 1,144.71

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.