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Finding the Fourth Proportional to 718,699.87, 991,801.78 and 396,409.19

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Solution

The fourth proportional to 718,699.87, 991,801.78 and 396,409.19 is: 547,042.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,699.87 : 991,801.78 = 396,409.19 : x
  2. Step 2: Convert to fraction form
    718,699.87/991,801.78 = 396,409.19/x
  3. Step 3: Cross multiply
    718,699.87x = 991,801.78 × 396,409.19
  4. Step 4: Simplify right side
    718,699.87x = 393,159,341,738.84
  5. Step 5: Solve for x
    x = 393,159,341,738.84/718,699.87
  6. Step 6: Final answer
    x = 547,042.46

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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.