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Finding the Fourth Proportional to 665,108.40, 997,079.40 and 398,974.80

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Solution

The fourth proportional to 665,108.40, 997,079.40 and 398,974.80 is: 598,112.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,108.40 : 997,079.40 = 398,974.80 : x
  2. Step 2: Convert to fraction form
    665,108.40/997,079.40 = 398,974.80/x
  3. Step 3: Cross multiply
    665,108.40x = 997,079.40 × 398,974.80
  4. Step 4: Simplify right side
    665,108.40x = 397,809,554,199.12
  5. Step 5: Solve for x
    x = 397,809,554,199.12/665,108.40
  6. Step 6: Final answer
    x = 598,112.36

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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.