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Finding the Fourth Proportional to 665,554.52, 918,653.64 and 393,716.90

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Solution

The fourth proportional to 665,554.52, 918,653.64 and 393,716.90 is: 543,440.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,554.52 : 918,653.64 = 393,716.90 : x
  2. Step 2: Convert to fraction form
    665,554.52/918,653.64 = 393,716.90/x
  3. Step 3: Cross multiply
    665,554.52x = 918,653.64 × 393,716.90
  4. Step 4: Simplify right side
    665,554.52x = 361,689,463,314.52
  5. Step 5: Solve for x
    x = 361,689,463,314.52/665,554.52
  6. Step 6: Final answer
    x = 543,440.77

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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.