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Finding the Fourth Proportional to 85,934.40, 128,901.60 and 81,013.65

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Solution

The fourth proportional to 85,934.40, 128,901.60 and 81,013.65 is: 121,520.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,934.40 : 128,901.60 = 81,013.65 : x
  2. Step 2: Convert to fraction form
    85,934.40/128,901.60 = 81,013.65/x
  3. Step 3: Cross multiply
    85,934.40x = 128,901.60 × 81,013.65
  4. Step 4: Simplify right side
    85,934.40x = 10,442,789,106.84
  5. Step 5: Solve for x
    x = 10,442,789,106.84/85,934.40
  6. Step 6: Final answer
    x = 121,520.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.