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Finding the Fourth Proportional to 686,641.98, 947,663.99 and 380,786.39

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Solution

The fourth proportional to 686,641.98, 947,663.99 and 380,786.39 is: 525,539.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,641.98 : 947,663.99 = 380,786.39 : x
  2. Step 2: Convert to fraction form
    686,641.98/947,663.99 = 380,786.39/x
  3. Step 3: Cross multiply
    686,641.98x = 947,663.99 × 380,786.39
  4. Step 4: Simplify right side
    686,641.98x = 360,857,543,042.84
  5. Step 5: Solve for x
    x = 360,857,543,042.84/686,641.98
  6. Step 6: Final answer
    x = 525,539.59

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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.