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Finding the Fourth Proportional to 391,168.80, 539,845.20 and 247,876.56

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Solution

The fourth proportional to 391,168.80, 539,845.20 and 247,876.56 is: 342,090.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,168.80 : 539,845.20 = 247,876.56 : x
  2. Step 2: Convert to fraction form
    391,168.80/539,845.20 = 247,876.56/x
  3. Step 3: Cross multiply
    391,168.80x = 539,845.20 × 247,876.56
  4. Step 4: Simplify right side
    391,168.80x = 133,814,971,108.51
  5. Step 5: Solve for x
    x = 133,814,971,108.51/391,168.80
  6. Step 6: Final answer
    x = 342,090.09

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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.