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Finding the Third Proportional to 77,720.50 and 120,017

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Solution

The third proportional to 77,720.50 and 120,017 is: 185,331.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,720.50 : 120,017 = 120,017 : x
  2. Step 2: Convert to fraction form
    77,720.50/120,017 = 120,017/x
  3. Step 3: Cross multiply
    77,720.50x = 120,017 × 120,017
  4. Step 4: Simplify right side
    77,720.50x = 14,404,080,289
  5. Step 5: Solve for x
    x = 14,404,080,289/77,720.50
  6. Step 6: Final answer
    x = 185,331.80

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.