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Finding the Fourth Proportional to 515,609.36, 711,530.21 and 286,153.32

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Solution

The fourth proportional to 515,609.36, 711,530.21 and 286,153.32 is: 394,885.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,609.36 : 711,530.21 = 286,153.32 : x
  2. Step 2: Convert to fraction form
    515,609.36/711,530.21 = 286,153.32/x
  3. Step 3: Cross multiply
    515,609.36x = 711,530.21 × 286,153.32
  4. Step 4: Simplify right side
    515,609.36x = 203,606,730,441.03
  5. Step 5: Solve for x
    x = 203,606,730,441.03/515,609.36
  6. Step 6: Final answer
    x = 394,885.64

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.