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Finding the Fourth Proportional to 711,013.23, 981,198.80 and 388,718.19

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Solution

The fourth proportional to 711,013.23, 981,198.80 and 388,718.19 is: 536,431.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,013.23 : 981,198.80 = 388,718.19 : x
  2. Step 2: Convert to fraction form
    711,013.23/981,198.80 = 388,718.19/x
  3. Step 3: Cross multiply
    711,013.23x = 981,198.80 × 388,718.19
  4. Step 4: Simplify right side
    711,013.23x = 381,409,819,622.58
  5. Step 5: Solve for x
    x = 381,409,819,622.58/711,013.23
  6. Step 6: Final answer
    x = 536,431.40

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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.