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Finding the Fourth Proportional to 478,812.80, 718,219.20 and 419,715.20

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Solution

The fourth proportional to 478,812.80, 718,219.20 and 419,715.20 is: 629,572.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,812.80 : 718,219.20 = 419,715.20 : x
  2. Step 2: Convert to fraction form
    478,812.80/718,219.20 = 419,715.20/x
  3. Step 3: Cross multiply
    478,812.80x = 718,219.20 × 419,715.20
  4. Step 4: Simplify right side
    478,812.80x = 301,447,515,171.84
  5. Step 5: Solve for x
    x = 301,447,515,171.84/478,812.80
  6. Step 6: Final answer
    x = 629,572.80

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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.