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Finding the Fourth Proportional to 490,997.76, 674,640.48 and 390,220.80

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Solution

The fourth proportional to 490,997.76, 674,640.48 and 390,220.80 is: 536,170.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    490,997.76 : 674,640.48 = 390,220.80 : x
  2. Step 2: Convert to fraction form
    490,997.76/674,640.48 = 390,220.80/x
  3. Step 3: Cross multiply
    490,997.76x = 674,640.48 × 390,220.80
  4. Step 4: Simplify right side
    490,997.76x = 263,258,747,817.98
  5. Step 5: Solve for x
    x = 263,258,747,817.98/490,997.76
  6. Step 6: Final answer
    x = 536,170.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.