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Finding the Fourth Proportional to 665,087.10, 997,630.65 and 399,147.90

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Solution

The fourth proportional to 665,087.10, 997,630.65 and 399,147.90 is: 598,721.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,087.10 : 997,630.65 = 399,147.90 : x
  2. Step 2: Convert to fraction form
    665,087.10/997,630.65 = 399,147.90/x
  3. Step 3: Cross multiply
    665,087.10x = 997,630.65 × 399,147.90
  4. Step 4: Simplify right side
    665,087.10x = 398,202,178,923.14
  5. Step 5: Solve for x
    x = 398,202,178,923.14/665,087.10
  6. Step 6: Final answer
    x = 598,721.85

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Similar ratio
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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.