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Finding the Fourth Proportional to 681,098.97, 939,880.71 and 390,695.88

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Solution

The fourth proportional to 681,098.97, 939,880.71 and 390,695.88 is: 539,139.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,098.97 : 939,880.71 = 390,695.88 : x
  2. Step 2: Convert to fraction form
    681,098.97/939,880.71 = 390,695.88/x
  3. Step 3: Cross multiply
    681,098.97x = 939,880.71 × 390,695.88
  4. Step 4: Simplify right side
    681,098.97x = 367,207,521,088.48
  5. Step 5: Solve for x
    x = 367,207,521,088.48/681,098.97
  6. Step 6: Final answer
    x = 539,139.74

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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.