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Finding the Fourth Proportional to 398,781.72, 550,179.81 and 255,620.70

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Solution

The fourth proportional to 398,781.72, 550,179.81 and 255,620.70 is: 352,667.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,781.72 : 550,179.81 = 255,620.70 : x
  2. Step 2: Convert to fraction form
    398,781.72/550,179.81 = 255,620.70/x
  3. Step 3: Cross multiply
    398,781.72x = 550,179.81 × 255,620.70
  4. Step 4: Simplify right side
    398,781.72x = 140,637,348,158.07
  5. Step 5: Solve for x
    x = 140,637,348,158.07/398,781.72
  6. Step 6: Final answer
    x = 352,667.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.