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Finding the Third Proportional to 42,920 and 66,324

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Solution

The third proportional to 42,920 and 66,324 is: 102,490.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,920 : 66,324 = 66,324 : x
  2. Step 2: Convert to fraction form
    42,920/66,324 = 66,324/x
  3. Step 3: Cross multiply
    42,920x = 66,324 × 66,324
  4. Step 4: Simplify right side
    42,920x = 4,398,872,976
  5. Step 5: Solve for x
    x = 4,398,872,976/42,920
  6. Step 6: Final answer
    x = 102,490.05

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.