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Finding the Fourth Proportional to 519,940.80, 779,911.20 and 145,915.20

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Solution

The fourth proportional to 519,940.80, 779,911.20 and 145,915.20 is: 218,872.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,940.80 : 779,911.20 = 145,915.20 : x
  2. Step 2: Convert to fraction form
    519,940.80/779,911.20 = 145,915.20/x
  3. Step 3: Cross multiply
    519,940.80x = 779,911.20 × 145,915.20
  4. Step 4: Simplify right side
    519,940.80x = 113,800,898,730.24
  5. Step 5: Solve for x
    x = 113,800,898,730.24/519,940.80
  6. Step 6: Final answer
    x = 218,872.80

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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.