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Finding the Fourth Proportional to 429,190.60, 643,785.90 and 261,040.68

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Solution

The fourth proportional to 429,190.60, 643,785.90 and 261,040.68 is: 391,561.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,190.60 : 643,785.90 = 261,040.68 : x
  2. Step 2: Convert to fraction form
    429,190.60/643,785.90 = 261,040.68/x
  3. Step 3: Cross multiply
    429,190.60x = 643,785.90 × 261,040.68
  4. Step 4: Simplify right side
    429,190.60x = 168,054,305,891.48
  5. Step 5: Solve for x
    x = 168,054,305,891.48/429,190.60
  6. Step 6: Final answer
    x = 391,561.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.