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Finding the Fourth Proportional to 839,872.40, 1,259,808.60 and 521,007.80

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Solution

The fourth proportional to 839,872.40, 1,259,808.60 and 521,007.80 is: 781,511.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    839,872.40 : 1,259,808.60 = 521,007.80 : x
  2. Step 2: Convert to fraction form
    839,872.40/1,259,808.60 = 521,007.80/x
  3. Step 3: Cross multiply
    839,872.40x = 1,259,808.60 × 521,007.80
  4. Step 4: Simplify right side
    839,872.40x = 656,370,107,107.08
  5. Step 5: Solve for x
    x = 656,370,107,107.08/839,872.40
  6. Step 6: Final answer
    x = 781,511.70

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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.