Home / 820,138.80-1,230,208.20-442,225.20

Finding the Fourth Proportional to 820,138.80, 1,230,208.20 and 442,225.20

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Solution

The fourth proportional to 820,138.80, 1,230,208.20 and 442,225.20 is: 663,337.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,138.80 : 1,230,208.20 = 442,225.20 : x
  2. Step 2: Convert to fraction form
    820,138.80/1,230,208.20 = 442,225.20/x
  3. Step 3: Cross multiply
    820,138.80x = 1,230,208.20 × 442,225.20
  4. Step 4: Simplify right side
    820,138.80x = 544,029,067,286.64
  5. Step 5: Solve for x
    x = 544,029,067,286.64/820,138.80
  6. Step 6: Final answer
    x = 663,337.80

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1.5x scale

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.