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Finding the Third Proportional to 521.72 and 780.19

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Solution

The third proportional to 521.72 and 780.19 is: 1,166.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.72 : 780.19 = 780.19 : x
  2. Step 2: Convert to fraction form
    521.72/780.19 = 780.19/x
  3. Step 3: Cross multiply
    521.72x = 780.19 × 780.19
  4. Step 4: Simplify right side
    521.72x = 608,692.54
  5. Step 5: Solve for x
    x = 608,692.54/521.72
  6. Step 6: Final answer
    x = 1,166.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.