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Finding the Fourth Proportional to 720,711.72, 994,562.82 and 394,011.72

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Solution

The fourth proportional to 720,711.72, 994,562.82 and 394,011.72 is: 543,725.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,711.72 : 994,562.82 = 394,011.72 : x
  2. Step 2: Convert to fraction form
    720,711.72/994,562.82 = 394,011.72/x
  3. Step 3: Cross multiply
    720,711.72x = 994,562.82 × 394,011.72
  4. Step 4: Simplify right side
    720,711.72x = 391,869,407,356.25
  5. Step 5: Solve for x
    x = 391,869,407,356.25/720,711.72
  6. Step 6: Final answer
    x = 543,725.59

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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.