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Finding the Fourth Proportional to 611,712.60, 917,568.90 and 399,136.20

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Solution

The fourth proportional to 611,712.60, 917,568.90 and 399,136.20 is: 598,704.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,712.60 : 917,568.90 = 399,136.20 : x
  2. Step 2: Convert to fraction form
    611,712.60/917,568.90 = 399,136.20/x
  3. Step 3: Cross multiply
    611,712.60x = 917,568.90 × 399,136.20
  4. Step 4: Simplify right side
    611,712.60x = 366,234,963,984.18
  5. Step 5: Solve for x
    x = 366,234,963,984.18/611,712.60
  6. Step 6: Final answer
    x = 598,704.30

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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.