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Finding the Third Proportional to 218,726 and 287,205

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Solution

The third proportional to 218,726 and 287,205 is: 377,123.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,726 : 287,205 = 287,205 : x
  2. Step 2: Convert to fraction form
    218,726/287,205 = 287,205/x
  3. Step 3: Cross multiply
    218,726x = 287,205 × 287,205
  4. Step 4: Simplify right side
    218,726x = 82,486,712,025
  5. Step 5: Solve for x
    x = 82,486,712,025/218,726
  6. Step 6: Final answer
    x = 377,123.49

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.