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Finding the Third Proportional to 39,820 and 87,289

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Solution

The third proportional to 39,820 and 87,289 is: 191,345.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,820 : 87,289 = 87,289 : x
  2. Step 2: Convert to fraction form
    39,820/87,289 = 87,289/x
  3. Step 3: Cross multiply
    39,820x = 87,289 × 87,289
  4. Step 4: Simplify right side
    39,820x = 7,619,369,521
  5. Step 5: Solve for x
    x = 7,619,369,521/39,820
  6. Step 6: Final answer
    x = 191,345.29

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.