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Finding the Fourth Proportional to 521,643.41, 786,487.91 and 518,404.94

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Solution

The fourth proportional to 521,643.41, 786,487.91 and 518,404.94 is: 781,605.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,643.41 : 786,487.91 = 518,404.94 : x
  2. Step 2: Convert to fraction form
    521,643.41/786,487.91 = 518,404.94/x
  3. Step 3: Cross multiply
    521,643.41x = 786,487.91 × 518,404.94
  4. Step 4: Simplify right side
    521,643.41x = 407,719,215,157.85
  5. Step 5: Solve for x
    x = 407,719,215,157.85/521,643.41
  6. Step 6: Final answer
    x = 781,605.23

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.