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Finding the Fourth Proportional to 128,916.70, 193,375.05 and 86,926.30

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Solution

The fourth proportional to 128,916.70, 193,375.05 and 86,926.30 is: 130,389.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,916.70 : 193,375.05 = 86,926.30 : x
  2. Step 2: Convert to fraction form
    128,916.70/193,375.05 = 86,926.30/x
  3. Step 3: Cross multiply
    128,916.70x = 193,375.05 × 86,926.30
  4. Step 4: Simplify right side
    128,916.70x = 16,809,377,608.82
  5. Step 5: Solve for x
    x = 16,809,377,608.82/128,916.70
  6. Step 6: Final answer
    x = 130,389.45

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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.