Home / 643,946.20-965,919.30-392,003.80

Finding the Fourth Proportional to 643,946.20, 965,919.30 and 392,003.80

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Solution

The fourth proportional to 643,946.20, 965,919.30 and 392,003.80 is: 588,005.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,946.20 : 965,919.30 = 392,003.80 : x
  2. Step 2: Convert to fraction form
    643,946.20/965,919.30 = 392,003.80/x
  3. Step 3: Cross multiply
    643,946.20x = 965,919.30 × 392,003.80
  4. Step 4: Simplify right side
    643,946.20x = 378,644,036,093.34
  5. Step 5: Solve for x
    x = 378,644,036,093.34/643,946.20
  6. Step 6: Final answer
    x = 588,005.70

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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.