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Finding the Fourth Proportional to 427,420.80, 641,131.20 and 399,427.20

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Solution

The fourth proportional to 427,420.80, 641,131.20 and 399,427.20 is: 599,140.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,420.80 : 641,131.20 = 399,427.20 : x
  2. Step 2: Convert to fraction form
    427,420.80/641,131.20 = 399,427.20/x
  3. Step 3: Cross multiply
    427,420.80x = 641,131.20 × 399,427.20
  4. Step 4: Simplify right side
    427,420.80x = 256,085,240,048.64
  5. Step 5: Solve for x
    x = 256,085,240,048.64/427,420.80
  6. Step 6: Final answer
    x = 599,140.80

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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.