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Finding the Fourth Proportional to 517,545.40, 776,318.10 and 391,574.20

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Solution

The fourth proportional to 517,545.40, 776,318.10 and 391,574.20 is: 587,361.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    517,545.40 : 776,318.10 = 391,574.20 : x
  2. Step 2: Convert to fraction form
    517,545.40/776,318.10 = 391,574.20/x
  3. Step 3: Cross multiply
    517,545.40x = 776,318.10 × 391,574.20
  4. Step 4: Simplify right side
    517,545.40x = 303,986,138,953.02
  5. Step 5: Solve for x
    x = 303,986,138,953.02/517,545.40
  6. Step 6: Final answer
    x = 587,361.30

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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.