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Finding the Third Proportional to 55,209 and 87,564

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Solution

The third proportional to 55,209 and 87,564 is: 138,880.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,209 : 87,564 = 87,564 : x
  2. Step 2: Convert to fraction form
    55,209/87,564 = 87,564/x
  3. Step 3: Cross multiply
    55,209x = 87,564 × 87,564
  4. Step 4: Simplify right side
    55,209x = 7,667,454,096
  5. Step 5: Solve for x
    x = 7,667,454,096/55,209
  6. Step 6: Final answer
    x = 138,880.51

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.