Home / 639,028.40-957,376.20-389,418.80

Finding the Fourth Proportional to 639,028.40, 957,376.20 and 389,418.80

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Solution

The fourth proportional to 639,028.40, 957,376.20 and 389,418.80 is: 583,417.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,028.40 : 957,376.20 = 389,418.80 : x
  2. Step 2: Convert to fraction form
    639,028.40/957,376.20 = 389,418.80/x
  3. Step 3: Cross multiply
    639,028.40x = 957,376.20 × 389,418.80
  4. Step 4: Simplify right side
    639,028.40x = 372,820,290,952.56
  5. Step 5: Solve for x
    x = 372,820,290,952.56/639,028.40
  6. Step 6: Final answer
    x = 583,417.41

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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.