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Finding the Fourth Proportional to 911,205.60, 1,366,808.40 and 405,765.60

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Solution

The fourth proportional to 911,205.60, 1,366,808.40 and 405,765.60 is: 608,648.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    911,205.60 : 1,366,808.40 = 405,765.60 : x
  2. Step 2: Convert to fraction form
    911,205.60/1,366,808.40 = 405,765.60/x
  3. Step 3: Cross multiply
    911,205.60x = 1,366,808.40 × 405,765.60
  4. Step 4: Simplify right side
    911,205.60x = 554,603,830,511.04
  5. Step 5: Solve for x
    x = 554,603,830,511.04/911,205.60
  6. Step 6: Final answer
    x = 608,648.40

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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.