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Finding the Fourth Proportional to 681,069.66, 939,793.83 and 390,666.18

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Solution

The fourth proportional to 681,069.66, 939,793.83 and 390,666.18 is: 539,072.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,069.66 : 939,793.83 = 390,666.18 : x
  2. Step 2: Convert to fraction form
    681,069.66/939,793.83 = 390,666.18/x
  3. Step 3: Cross multiply
    681,069.66x = 939,793.83 × 390,666.18
  4. Step 4: Simplify right side
    681,069.66x = 367,145,665,553.67
  5. Step 5: Solve for x
    x = 367,145,665,553.67/681,069.66
  6. Step 6: Final answer
    x = 539,072.12

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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.