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Finding the Fourth Proportional to 427,231.20, 640,846.80 and 177,880.80

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Solution

The fourth proportional to 427,231.20, 640,846.80 and 177,880.80 is: 266,821.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,231.20 : 640,846.80 = 177,880.80 : x
  2. Step 2: Convert to fraction form
    427,231.20/640,846.80 = 177,880.80/x
  3. Step 3: Cross multiply
    427,231.20x = 640,846.80 × 177,880.80
  4. Step 4: Simplify right side
    427,231.20x = 113,994,341,461.44
  5. Step 5: Solve for x
    x = 113,994,341,461.44/427,231.20
  6. Step 6: Final answer
    x = 266,821.20

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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.