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Finding the Third Proportional to 4,691 and 9,920.50

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Solution

The third proportional to 4,691 and 9,920.50 is: 20,979.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,691 : 9,920.50 = 9,920.50 : x
  2. Step 2: Convert to fraction form
    4,691/9,920.50 = 9,920.50/x
  3. Step 3: Cross multiply
    4,691x = 9,920.50 × 9,920.50
  4. Step 4: Simplify right side
    4,691x = 98,416,320.25
  5. Step 5: Solve for x
    x = 98,416,320.25/4,691
  6. Step 6: Final answer
    x = 20,979.82

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.