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Finding the Third Proportional to 778.36 and 1,139.06

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Solution

The third proportional to 778.36 and 1,139.06 is: 1,666.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.36 : 1,139.06 = 1,139.06 : x
  2. Step 2: Convert to fraction form
    778.36/1,139.06 = 1,139.06/x
  3. Step 3: Cross multiply
    778.36x = 1,139.06 × 1,139.06
  4. Step 4: Simplify right side
    778.36x = 1,297,463.38
  5. Step 5: Solve for x
    x = 1,297,463.38/778.36
  6. Step 6: Final answer
    x = 1,666.92

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.