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Finding the Fourth Proportional to 128,866.92, 177,757.74 and 85,259.40

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Solution

The fourth proportional to 128,866.92, 177,757.74 and 85,259.40 is: 117,605.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,866.92 : 177,757.74 = 85,259.40 : x
  2. Step 2: Convert to fraction form
    128,866.92/177,757.74 = 85,259.40/x
  3. Step 3: Cross multiply
    128,866.92x = 177,757.74 × 85,259.40
  4. Step 4: Simplify right side
    128,866.92x = 15,155,518,257.76
  5. Step 5: Solve for x
    x = 15,155,518,257.76/128,866.92
  6. Step 6: Final answer
    x = 117,605.96

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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.