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Finding the Fourth Proportional to 691,972.32, 954,702 and 405,400.80

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Solution

The fourth proportional to 691,972.32, 954,702 and 405,400.80 is: 559,324.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,972.32 : 954,702 = 405,400.80 : x
  2. Step 2: Convert to fraction form
    691,972.32/954,702 = 405,400.80/x
  3. Step 3: Cross multiply
    691,972.32x = 954,702 × 405,400.80
  4. Step 4: Simplify right side
    691,972.32x = 387,036,954,561.60
  5. Step 5: Solve for x
    x = 387,036,954,561.60/691,972.32
  6. Step 6: Final answer
    x = 559,324.33

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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.