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Finding the Fourth Proportional to 458,427.20, 687,640.80 and 419,028.80

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Solution

The fourth proportional to 458,427.20, 687,640.80 and 419,028.80 is: 628,543.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,427.20 : 687,640.80 = 419,028.80 : x
  2. Step 2: Convert to fraction form
    458,427.20/687,640.80 = 419,028.80/x
  3. Step 3: Cross multiply
    458,427.20x = 687,640.80 × 419,028.80
  4. Step 4: Simplify right side
    458,427.20x = 288,141,299,255.04
  5. Step 5: Solve for x
    x = 288,141,299,255.04/458,427.20
  6. Step 6: Final answer
    x = 628,543.20

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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.