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Finding the Fourth Proportional to 92,805.69, 128,005.68 and 85,173.56

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Solution

The fourth proportional to 92,805.69, 128,005.68 and 85,173.56 is: 117,478.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,805.69 : 128,005.68 = 85,173.56 : x
  2. Step 2: Convert to fraction form
    92,805.69/128,005.68 = 85,173.56/x
  3. Step 3: Cross multiply
    92,805.69x = 128,005.68 × 85,173.56
  4. Step 4: Simplify right side
    92,805.69x = 10,902,698,793.37
  5. Step 5: Solve for x
    x = 10,902,698,793.37/92,805.69
  6. Step 6: Final answer
    x = 117,478.78

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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.