Home / 820,139.80-1,230,209.70-442,226.20

Finding the Fourth Proportional to 820,139.80, 1,230,209.70 and 442,226.20

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Solution

The fourth proportional to 820,139.80, 1,230,209.70 and 442,226.20 is: 663,339.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,139.80 : 1,230,209.70 = 442,226.20 : x
  2. Step 2: Convert to fraction form
    820,139.80/1,230,209.70 = 442,226.20/x
  3. Step 3: Cross multiply
    820,139.80x = 1,230,209.70 × 442,226.20
  4. Step 4: Simplify right side
    820,139.80x = 544,030,960,834.14
  5. Step 5: Solve for x
    x = 544,030,960,834.14/820,139.80
  6. Step 6: Final answer
    x = 663,339.30

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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.