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Finding the Fourth Proportional to 665,074.40, 997,028.40 and 398,940.80

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Solution

The fourth proportional to 665,074.40, 997,028.40 and 398,940.80 is: 598,061.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,074.40 : 997,028.40 = 398,940.80 : x
  2. Step 2: Convert to fraction form
    665,074.40/997,028.40 = 398,940.80/x
  3. Step 3: Cross multiply
    665,074.40x = 997,028.40 × 398,940.80
  4. Step 4: Simplify right side
    665,074.40x = 397,755,307,518.72
  5. Step 5: Solve for x
    x = 397,755,307,518.72/665,074.40
  6. Step 6: Final answer
    x = 598,061.37

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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.