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Finding the Fourth Proportional to 643,496.28, 888,440.86 and 398,740.77

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Solution

The fourth proportional to 643,496.28, 888,440.86 and 398,740.77 is: 550,520.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,496.28 : 888,440.86 = 398,740.77 : x
  2. Step 2: Convert to fraction form
    643,496.28/888,440.86 = 398,740.77/x
  3. Step 3: Cross multiply
    643,496.28x = 888,440.86 × 398,740.77
  4. Step 4: Simplify right side
    643,496.28x = 354,257,591,619.01
  5. Step 5: Solve for x
    x = 354,257,591,619.01/643,496.28
  6. Step 6: Final answer
    x = 550,520.03

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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.