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Finding the Third Proportional to 39,387 and 86,430

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Solution

The third proportional to 39,387 and 86,430 is: 189,660.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,387 : 86,430 = 86,430 : x
  2. Step 2: Convert to fraction form
    39,387/86,430 = 86,430/x
  3. Step 3: Cross multiply
    39,387x = 86,430 × 86,430
  4. Step 4: Simplify right side
    39,387x = 7,470,144,900
  5. Step 5: Solve for x
    x = 7,470,144,900/39,387
  6. Step 6: Final answer
    x = 189,660.16

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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.