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Finding the Fourth Proportional to 603,669.30, 905,503.95 and 391,092.90

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Solution

The fourth proportional to 603,669.30, 905,503.95 and 391,092.90 is: 586,639.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    603,669.30 : 905,503.95 = 391,092.90 : x
  2. Step 2: Convert to fraction form
    603,669.30/905,503.95 = 391,092.90/x
  3. Step 3: Cross multiply
    603,669.30x = 905,503.95 × 391,092.90
  4. Step 4: Simplify right side
    603,669.30x = 354,136,165,766.96
  5. Step 5: Solve for x
    x = 354,136,165,766.96/603,669.30
  6. Step 6: Final answer
    x = 586,639.35

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Double scale
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Similar ratio
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1.5x scale

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.