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Finding the Third Proportional to 128,778.75 and 279,718.88

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Solution

The third proportional to 128,778.75 and 279,718.88 is: 607,574.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,778.75 : 279,718.88 = 279,718.88 : x
  2. Step 2: Convert to fraction form
    128,778.75/279,718.88 = 279,718.88/x
  3. Step 3: Cross multiply
    128,778.75x = 279,718.88 × 279,718.88
  4. Step 4: Simplify right side
    128,778.75x = 78,242,649,031.27
  5. Step 5: Solve for x
    x = 78,242,649,031.27/128,778.75
  6. Step 6: Final answer
    x = 607,574.22

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.