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Finding the Fourth Proportional to 620,066.87, 855,785.78 and 378,489.48

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Solution

The fourth proportional to 620,066.87, 855,785.78 and 378,489.48 is: 522,372.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,066.87 : 855,785.78 = 378,489.48 : x
  2. Step 2: Convert to fraction form
    620,066.87/855,785.78 = 378,489.48/x
  3. Step 3: Cross multiply
    620,066.87x = 855,785.78 × 378,489.48
  4. Step 4: Simplify right side
    620,066.87x = 323,905,912,971.15
  5. Step 5: Solve for x
    x = 323,905,912,971.15/620,066.87
  6. Step 6: Final answer
    x = 522,372.56

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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.