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Finding the Fourth Proportional to 611,792.10, 917,688.15 and 399,215.70

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Solution

The fourth proportional to 611,792.10, 917,688.15 and 399,215.70 is: 598,823.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,792.10 : 917,688.15 = 399,215.70 : x
  2. Step 2: Convert to fraction form
    611,792.10/917,688.15 = 399,215.70/x
  3. Step 3: Cross multiply
    611,792.10x = 917,688.15 × 399,215.70
  4. Step 4: Simplify right side
    611,792.10x = 366,355,517,183.96
  5. Step 5: Solve for x
    x = 366,355,517,183.96/611,792.10
  6. Step 6: Final answer
    x = 598,823.55

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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.