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Finding the Fourth Proportional to 665,527.80, 918,616.51 and 393,690.20

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Solution

The fourth proportional to 665,527.80, 918,616.51 and 393,690.20 is: 543,403.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,527.80 : 918,616.51 = 393,690.20 : x
  2. Step 2: Convert to fraction form
    665,527.80/918,616.51 = 393,690.20/x
  3. Step 3: Cross multiply
    665,527.80x = 918,616.51 × 393,690.20
  4. Step 4: Simplify right side
    665,527.80x = 361,650,320,333.86
  5. Step 5: Solve for x
    x = 361,650,320,333.86/665,527.80
  6. Step 6: Final answer
    x = 543,403.78

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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.