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Finding the Fourth Proportional to 617,969.80, 928,509.90 and 393,437.80

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Solution

The fourth proportional to 617,969.80, 928,509.90 and 393,437.80 is: 591,146.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    617,969.80 : 928,509.90 = 393,437.80 : x
  2. Step 2: Convert to fraction form
    617,969.80/928,509.90 = 393,437.80/x
  3. Step 3: Cross multiply
    617,969.80x = 928,509.90 × 393,437.80
  4. Step 4: Simplify right side
    617,969.80x = 365,310,892,334.22
  5. Step 5: Solve for x
    x = 365,310,892,334.22/617,969.80
  6. Step 6: Final answer
    x = 591,146.84

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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.