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Finding the Fourth Proportional to 398,757.96, 598,136.88 and 118,272.78

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Solution

The fourth proportional to 398,757.96, 598,136.88 and 118,272.78 is: 177,409.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,757.96 : 598,136.88 = 118,272.78 : x
  2. Step 2: Convert to fraction form
    398,757.96/598,136.88 = 118,272.78/x
  3. Step 3: Cross multiply
    398,757.96x = 598,136.88 × 118,272.78
  4. Step 4: Simplify right side
    398,757.96x = 70,743,311,618.13
  5. Step 5: Solve for x
    x = 70,743,311,618.13/398,757.96
  6. Step 6: Final answer
    x = 177,409.15

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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.