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Finding the Fourth Proportional to 665,087.80, 997,631.70 and 399,148.60

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Solution

The fourth proportional to 665,087.80, 997,631.70 and 399,148.60 is: 598,722.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,087.80 : 997,631.70 = 399,148.60 : x
  2. Step 2: Convert to fraction form
    665,087.80/997,631.70 = 399,148.60/x
  3. Step 3: Cross multiply
    665,087.80x = 997,631.70 × 399,148.60
  4. Step 4: Simplify right side
    665,087.80x = 398,203,296,370.62
  5. Step 5: Solve for x
    x = 398,203,296,370.62/665,087.80
  6. Step 6: Final answer
    x = 598,722.90

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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.