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Finding the Fourth Proportional to 436,039.80, 653,138.10 and 389,345.40

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Solution

The fourth proportional to 436,039.80, 653,138.10 and 389,345.40 is: 583,195.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    436,039.80 : 653,138.10 = 389,345.40 : x
  2. Step 2: Convert to fraction form
    436,039.80/653,138.10 = 389,345.40/x
  3. Step 3: Cross multiply
    436,039.80x = 653,138.10 × 389,345.40
  4. Step 4: Simplify right side
    436,039.80x = 254,296,314,799.74
  5. Step 5: Solve for x
    x = 254,296,314,799.74/436,039.80
  6. Step 6: Final answer
    x = 583,195.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.