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Finding the Third Proportional to 39,210 and 85,770

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Solution

The third proportional to 39,210 and 85,770 is: 187,617.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,210 : 85,770 = 85,770 : x
  2. Step 2: Convert to fraction form
    39,210/85,770 = 85,770/x
  3. Step 3: Cross multiply
    39,210x = 85,770 × 85,770
  4. Step 4: Simplify right side
    39,210x = 7,356,492,900
  5. Step 5: Solve for x
    x = 7,356,492,900/39,210
  6. Step 6: Final answer
    x = 187,617.77

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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.