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Finding the Third Proportional to 387.75 and 511.13

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Solution

The third proportional to 387.75 and 511.13 is: 673.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.75 : 511.13 = 511.13 : x
  2. Step 2: Convert to fraction form
    387.75/511.13 = 511.13/x
  3. Step 3: Cross multiply
    387.75x = 511.13 × 511.13
  4. Step 4: Simplify right side
    387.75x = 261,248.77
  5. Step 5: Solve for x
    x = 261,248.77/387.75
  6. Step 6: Final answer
    x = 673.76

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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.