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Finding the Third Proportional to 128,569.78 and 278,591.91

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Solution

The third proportional to 128,569.78 and 278,591.91 is: 603,667.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,569.78 : 278,591.91 = 278,591.91 : x
  2. Step 2: Convert to fraction form
    128,569.78/278,591.91 = 278,591.91/x
  3. Step 3: Cross multiply
    128,569.78x = 278,591.91 × 278,591.91
  4. Step 4: Simplify right side
    128,569.78x = 77,613,450,228.01
  5. Step 5: Solve for x
    x = 77,613,450,228.01/128,569.78
  6. Step 6: Final answer
    x = 603,667.90

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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.