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Finding the Fourth Proportional to 681,322.71, 940,246.64 and 390,987.39

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Solution

The fourth proportional to 681,322.71, 940,246.64 and 390,987.39 is: 539,574.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,322.71 : 940,246.64 = 390,987.39 : x
  2. Step 2: Convert to fraction form
    681,322.71/940,246.64 = 390,987.39/x
  3. Step 3: Cross multiply
    681,322.71x = 940,246.64 × 390,987.39
  4. Step 4: Simplify right side
    681,322.71x = 367,624,578,577.83
  5. Step 5: Solve for x
    x = 367,624,578,577.83/681,322.71
  6. Step 6: Final answer
    x = 539,574.82

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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.