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Finding the Fourth Proportional to 458,491.20, 687,736.80 and 419,092.80

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Solution

The fourth proportional to 458,491.20, 687,736.80 and 419,092.80 is: 628,639.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,491.20 : 687,736.80 = 419,092.80 : x
  2. Step 2: Convert to fraction form
    458,491.20/687,736.80 = 419,092.80/x
  3. Step 3: Cross multiply
    458,491.20x = 687,736.80 × 419,092.80
  4. Step 4: Simplify right side
    458,491.20x = 288,225,541,175.04
  5. Step 5: Solve for x
    x = 288,225,541,175.04/458,491.20
  6. Step 6: Final answer
    x = 628,639.20

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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.