Home / 678,121.20-1,015,869.60-397,310.40

Finding the Fourth Proportional to 678,121.20, 1,015,869.60 and 397,310.40

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Solution

The fourth proportional to 678,121.20, 1,015,869.60 and 397,310.40 is: 595,196.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,121.20 : 1,015,869.60 = 397,310.40 : x
  2. Step 2: Convert to fraction form
    678,121.20/1,015,869.60 = 397,310.40/x
  3. Step 3: Cross multiply
    678,121.20x = 1,015,869.60 × 397,310.40
  4. Step 4: Simplify right side
    678,121.20x = 403,615,557,123.84
  5. Step 5: Solve for x
    x = 403,615,557,123.84/678,121.20
  6. Step 6: Final answer
    x = 595,196.78

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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.