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Finding the Fourth Proportional to 665,599.20, 997,815.60 and 399,076.80

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Solution

The fourth proportional to 665,599.20, 997,815.60 and 399,076.80 is: 598,265.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,599.20 : 997,815.60 = 399,076.80 : x
  2. Step 2: Convert to fraction form
    665,599.20/997,815.60 = 399,076.80/x
  3. Step 3: Cross multiply
    665,599.20x = 997,815.60 × 399,076.80
  4. Step 4: Simplify right side
    665,599.20x = 398,205,056,638.08
  5. Step 5: Solve for x
    x = 398,205,056,638.08/665,599.20
  6. Step 6: Final answer
    x = 598,265.53

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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.