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Finding the Fourth Proportional to 713,663.38, 984,764.94 and 391,288.64

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Solution

The fourth proportional to 713,663.38, 984,764.94 and 391,288.64 is: 539,928.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,663.38 : 984,764.94 = 391,288.64 : x
  2. Step 2: Convert to fraction form
    713,663.38/984,764.94 = 391,288.64/x
  3. Step 3: Cross multiply
    713,663.38x = 984,764.94 × 391,288.64
  4. Step 4: Simplify right side
    713,663.38x = 385,327,334,092.28
  5. Step 5: Solve for x
    x = 385,327,334,092.28/713,663.38
  6. Step 6: Final answer
    x = 539,928.69

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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.