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Finding the Fourth Proportional to 398,940.80, 597,244.80 and 387,276.80

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Solution

The fourth proportional to 398,940.80, 597,244.80 and 387,276.80 is: 579,782.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,940.80 : 597,244.80 = 387,276.80 : x
  2. Step 2: Convert to fraction form
    398,940.80/597,244.80 = 387,276.80/x
  3. Step 3: Cross multiply
    398,940.80x = 597,244.80 × 387,276.80
  4. Step 4: Simplify right side
    398,940.80x = 231,299,054,960.64
  5. Step 5: Solve for x
    x = 231,299,054,960.64/398,940.80
  6. Step 6: Final answer
    x = 579,782.90

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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.