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Finding the Fourth Proportional to 643,693.35, 888,206.15 and 385,509.80

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Solution

The fourth proportional to 643,693.35, 888,206.15 and 385,509.80 is: 531,949.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,693.35 : 888,206.15 = 385,509.80 : x
  2. Step 2: Convert to fraction form
    643,693.35/888,206.15 = 385,509.80/x
  3. Step 3: Cross multiply
    643,693.35x = 888,206.15 × 385,509.80
  4. Step 4: Simplify right side
    643,693.35x = 342,412,175,245.27
  5. Step 5: Solve for x
    x = 342,412,175,245.27/643,693.35
  6. Step 6: Final answer
    x = 531,949.22

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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.