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Finding the Fourth Proportional to 681,411.32, 940,308.78 and 390,961.32

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Solution

The fourth proportional to 681,411.32, 940,308.78 and 390,961.32 is: 539,504.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,411.32 : 940,308.78 = 390,961.32 : x
  2. Step 2: Convert to fraction form
    681,411.32/940,308.78 = 390,961.32/x
  3. Step 3: Cross multiply
    681,411.32x = 940,308.78 × 390,961.32
  4. Step 4: Simplify right side
    681,411.32x = 367,624,359,776.34
  5. Step 5: Solve for x
    x = 367,624,359,776.34/681,411.32
  6. Step 6: Final answer
    x = 539,504.33

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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.