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Finding the Third Proportional to 30,789.50 and 66,639

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Solution

The third proportional to 30,789.50 and 66,639 is: 144,229.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,789.50 : 66,639 = 66,639 : x
  2. Step 2: Convert to fraction form
    30,789.50/66,639 = 66,639/x
  3. Step 3: Cross multiply
    30,789.50x = 66,639 × 66,639
  4. Step 4: Simplify right side
    30,789.50x = 4,440,756,321
  5. Step 5: Solve for x
    x = 4,440,756,321/30,789.50
  6. Step 6: Final answer
    x = 144,229.57

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.