Home / 820,156.20-1,230,428.70-420,858.60

Finding the Fourth Proportional to 820,156.20, 1,230,428.70 and 420,858.60

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Solution

The fourth proportional to 820,156.20, 1,230,428.70 and 420,858.60 is: 631,387.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,156.20 : 1,230,428.70 = 420,858.60 : x
  2. Step 2: Convert to fraction form
    820,156.20/1,230,428.70 = 420,858.60/x
  3. Step 3: Cross multiply
    820,156.20x = 1,230,428.70 × 420,858.60
  4. Step 4: Simplify right side
    820,156.20x = 517,836,500,081.82
  5. Step 5: Solve for x
    x = 517,836,500,081.82/820,156.20
  6. Step 6: Final answer
    x = 631,387.66

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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.