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Finding the Fourth Proportional to 515,661.36, 711,601.95 and 286,205.19

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Solution

The fourth proportional to 515,661.36, 711,601.95 and 286,205.19 is: 394,957.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,661.36 : 711,601.95 = 286,205.19 : x
  2. Step 2: Convert to fraction form
    515,661.36/711,601.95 = 286,205.19/x
  3. Step 3: Cross multiply
    515,661.36x = 711,601.95 × 286,205.19
  4. Step 4: Simplify right side
    515,661.36x = 203,664,171,304.12
  5. Step 5: Solve for x
    x = 203,664,171,304.12/515,661.36
  6. Step 6: Final answer
    x = 394,957.21

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.