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Finding the Third Proportional to 30,786 and 66,280

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Solution

The third proportional to 30,786 and 66,280 is: 142,695.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,786 : 66,280 = 66,280 : x
  2. Step 2: Convert to fraction form
    30,786/66,280 = 66,280/x
  3. Step 3: Cross multiply
    30,786x = 66,280 × 66,280
  4. Step 4: Simplify right side
    30,786x = 4,393,038,400
  5. Step 5: Solve for x
    x = 4,393,038,400/30,786
  6. Step 6: Final answer
    x = 142,695.98

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.