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Finding the Third Proportional to 387.09 and 835.13

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Solution

The third proportional to 387.09 and 835.13 is: 1,801.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.09 : 835.13 = 835.13 : x
  2. Step 2: Convert to fraction form
    387.09/835.13 = 835.13/x
  3. Step 3: Cross multiply
    387.09x = 835.13 × 835.13
  4. Step 4: Simplify right side
    387.09x = 697,433.77
  5. Step 5: Solve for x
    x = 697,433.77/387.09
  6. Step 6: Final answer
    x = 1,801.72

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.