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Finding the Fourth Proportional to 665,046.80, 997,570.20 and 399,107.60

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Solution

The fourth proportional to 665,046.80, 997,570.20 and 399,107.60 is: 598,661.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,046.80 : 997,570.20 = 399,107.60 : x
  2. Step 2: Convert to fraction form
    665,046.80/997,570.20 = 399,107.60/x
  3. Step 3: Cross multiply
    665,046.80x = 997,570.20 × 399,107.60
  4. Step 4: Simplify right side
    665,046.80x = 398,137,848,353.52
  5. Step 5: Solve for x
    x = 398,137,848,353.52/665,046.80
  6. Step 6: Final answer
    x = 598,661.40

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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.