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Finding the Fourth Proportional to 691,998.60, 954,964.98 and 405,688.20

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Solution

The fourth proportional to 691,998.60, 954,964.98 and 405,688.20 is: 559,853.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,998.60 : 954,964.98 = 405,688.20 : x
  2. Step 2: Convert to fraction form
    691,998.60/954,964.98 = 405,688.20/x
  3. Step 3: Cross multiply
    691,998.60x = 954,964.98 × 405,688.20
  4. Step 4: Simplify right side
    691,998.60x = 387,418,023,799.24
  5. Step 5: Solve for x
    x = 387,418,023,799.24/691,998.60
  6. Step 6: Final answer
    x = 559,853.77

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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.