Home / 820,123.70-1,230,379.95-420,826.10

Finding the Fourth Proportional to 820,123.70, 1,230,379.95 and 420,826.10

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Solution

The fourth proportional to 820,123.70, 1,230,379.95 and 420,826.10 is: 631,338.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,123.70 : 1,230,379.95 = 420,826.10 : x
  2. Step 2: Convert to fraction form
    820,123.70/1,230,379.95 = 420,826.10/x
  3. Step 3: Cross multiply
    820,123.70x = 1,230,379.95 × 420,826.10
  4. Step 4: Simplify right side
    820,123.70x = 517,775,995,876.70
  5. Step 5: Solve for x
    x = 517,775,995,876.70/820,123.70
  6. Step 6: Final answer
    x = 631,338.90

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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.