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Finding the Third Proportional to 129,856.50 and 202,990.50

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Solution

The third proportional to 129,856.50 and 202,990.50 is: 317,312.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,856.50 : 202,990.50 = 202,990.50 : x
  2. Step 2: Convert to fraction form
    129,856.50/202,990.50 = 202,990.50/x
  3. Step 3: Cross multiply
    129,856.50x = 202,990.50 × 202,990.50
  4. Step 4: Simplify right side
    129,856.50x = 41,205,143,090.25
  5. Step 5: Solve for x
    x = 41,205,143,090.25/129,856.50
  6. Step 6: Final answer
    x = 317,312.90

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.