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Finding the Fourth Proportional to 399,287.20, 598,930.80 and 394,038.40

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Solution

The fourth proportional to 399,287.20, 598,930.80 and 394,038.40 is: 591,057.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,287.20 : 598,930.80 = 394,038.40 : x
  2. Step 2: Convert to fraction form
    399,287.20/598,930.80 = 394,038.40/x
  3. Step 3: Cross multiply
    399,287.20x = 598,930.80 × 394,038.40
  4. Step 4: Simplify right side
    399,287.20x = 236,001,734,142.72
  5. Step 5: Solve for x
    x = 236,001,734,142.72/399,287.20
  6. Step 6: Final answer
    x = 591,057.60

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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.