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Finding the Fourth Proportional to 686,907.45, 947,939.22 and 380,989.89

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Solution

The fourth proportional to 686,907.45, 947,939.22 and 380,989.89 is: 525,769.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,907.45 : 947,939.22 = 380,989.89 : x
  2. Step 2: Convert to fraction form
    686,907.45/947,939.22 = 380,989.89/x
  3. Step 3: Cross multiply
    686,907.45x = 947,939.22 × 380,989.89
  4. Step 4: Simplify right side
    686,907.45x = 361,155,259,154.49
  5. Step 5: Solve for x
    x = 361,155,259,154.49/686,907.45
  6. Step 6: Final answer
    x = 525,769.90

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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.