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Finding the Third Proportional to 9,919.81 and 21,358.13

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Solution

The third proportional to 9,919.81 and 21,358.13 is: 45,985.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,919.81 : 21,358.13 = 21,358.13 : x
  2. Step 2: Convert to fraction form
    9,919.81/21,358.13 = 21,358.13/x
  3. Step 3: Cross multiply
    9,919.81x = 21,358.13 × 21,358.13
  4. Step 4: Simplify right side
    9,919.81x = 456,169,878.95
  5. Step 5: Solve for x
    x = 456,169,878.95/9,919.81
  6. Step 6: Final answer
    x = 45,985.75

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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.