Home / 643,509.60-887,914.56-388,874.40

Finding the Fourth Proportional to 643,509.60, 887,914.56 and 388,874.40

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Solution

The fourth proportional to 643,509.60, 887,914.56 and 388,874.40 is: 536,568.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,509.60 : 887,914.56 = 388,874.40 : x
  2. Step 2: Convert to fraction form
    643,509.60/887,914.56 = 388,874.40/x
  3. Step 3: Cross multiply
    643,509.60x = 887,914.56 × 388,874.40
  4. Step 4: Simplify right side
    643,509.60x = 345,287,241,771.26
  5. Step 5: Solve for x
    x = 345,287,241,771.26/643,509.60
  6. Step 6: Final answer
    x = 536,568.91

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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.