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Finding the Third Proportional to 128,502.75 and 278,457

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Solution

The third proportional to 128,502.75 and 278,457 is: 603,397.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,502.75 : 278,457 = 278,457 : x
  2. Step 2: Convert to fraction form
    128,502.75/278,457 = 278,457/x
  3. Step 3: Cross multiply
    128,502.75x = 278,457 × 278,457
  4. Step 4: Simplify right side
    128,502.75x = 77,538,300,849
  5. Step 5: Solve for x
    x = 77,538,300,849/128,502.75
  6. Step 6: Final answer
    x = 603,397.99

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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.