Home / 820,138.20-1,230,401.70-420,840.60

Finding the Fourth Proportional to 820,138.20, 1,230,401.70 and 420,840.60

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Solution

The fourth proportional to 820,138.20, 1,230,401.70 and 420,840.60 is: 631,360.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,138.20 : 1,230,401.70 = 420,840.60 : x
  2. Step 2: Convert to fraction form
    820,138.20/1,230,401.70 = 420,840.60/x
  3. Step 3: Cross multiply
    820,138.20x = 1,230,401.70 × 420,840.60
  4. Step 4: Simplify right side
    820,138.20x = 517,802,989,669.02
  5. Step 5: Solve for x
    x = 517,802,989,669.02/820,138.20
  6. Step 6: Final answer
    x = 631,360.65

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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.