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Finding the Fourth Proportional to 680,409.36, 938,964.96 and 393,944.40

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Solution

The fourth proportional to 680,409.36, 938,964.96 and 393,944.40 is: 543,643.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,409.36 : 938,964.96 = 393,944.40 : x
  2. Step 2: Convert to fraction form
    680,409.36/938,964.96 = 393,944.40/x
  3. Step 3: Cross multiply
    680,409.36x = 938,964.96 × 393,944.40
  4. Step 4: Simplify right side
    680,409.36x = 369,899,987,788.22
  5. Step 5: Solve for x
    x = 369,899,987,788.22/680,409.36
  6. Step 6: Final answer
    x = 543,643.30

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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.