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Finding the Fourth Proportional to 391,643.91, 540,286.20 and 230,396.40

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Solution

The fourth proportional to 391,643.91, 540,286.20 and 230,396.40 is: 317,839.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,643.91 : 540,286.20 = 230,396.40 : x
  2. Step 2: Convert to fraction form
    391,643.91/540,286.20 = 230,396.40/x
  3. Step 3: Cross multiply
    391,643.91x = 540,286.20 × 230,396.40
  4. Step 4: Simplify right side
    391,643.91x = 124,479,995,449.68
  5. Step 5: Solve for x
    x = 124,479,995,449.68/391,643.91
  6. Step 6: Final answer
    x = 317,839.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.