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Finding the Third Proportional to 42,390 and 66,663

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Solution

The third proportional to 42,390 and 66,663 is: 104,835.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,390 : 66,663 = 66,663 : x
  2. Step 2: Convert to fraction form
    42,390/66,663 = 66,663/x
  3. Step 3: Cross multiply
    42,390x = 66,663 × 66,663
  4. Step 4: Simplify right side
    42,390x = 4,443,955,569
  5. Step 5: Solve for x
    x = 4,443,955,569/42,390
  6. Step 6: Final answer
    x = 104,835.00

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.