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Finding the Fourth Proportional to 657,705.80, 986,558.70 and 618,998.60

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Solution

The fourth proportional to 657,705.80, 986,558.70 and 618,998.60 is: 928,497.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,705.80 : 986,558.70 = 618,998.60 : x
  2. Step 2: Convert to fraction form
    657,705.80/986,558.70 = 618,998.60/x
  3. Step 3: Cross multiply
    657,705.80x = 986,558.70 × 618,998.60
  4. Step 4: Simplify right side
    657,705.80x = 610,678,454,117.82
  5. Step 5: Solve for x
    x = 610,678,454,117.82/657,705.80
  6. Step 6: Final answer
    x = 928,497.90

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