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Finding the Fourth Proportional to 608,408.60, 839,716.19 and 390,889.19

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Solution

The fourth proportional to 608,408.60, 839,716.19 and 390,889.19 is: 539,499.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    608,408.60 : 839,716.19 = 390,889.19 : x
  2. Step 2: Convert to fraction form
    608,408.60/839,716.19 = 390,889.19/x
  3. Step 3: Cross multiply
    608,408.60x = 839,716.19 × 390,889.19
  4. Step 4: Simplify right side
    608,408.60x = 328,235,981,338.99
  5. Step 5: Solve for x
    x = 328,235,981,338.99/608,408.60
  6. Step 6: Final answer
    x = 539,499.25

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Double scale
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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.