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Finding the Fourth Proportional to 686,358.78, 947,210.07 and 395,862.31

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Solution

The fourth proportional to 686,358.78, 947,210.07 and 395,862.31 is: 546,310.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,358.78 : 947,210.07 = 395,862.31 : x
  2. Step 2: Convert to fraction form
    686,358.78/947,210.07 = 395,862.31/x
  3. Step 3: Cross multiply
    686,358.78x = 947,210.07 × 395,862.31
  4. Step 4: Simplify right side
    686,358.78x = 374,964,766,365.46
  5. Step 5: Solve for x
    x = 374,964,766,365.46/686,358.78
  6. Step 6: Final answer
    x = 546,310.15

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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.