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Finding the Fourth Proportional to 128,690.30, 193,061.27 and 44,453.54

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Solution

The fourth proportional to 128,690.30, 193,061.27 and 44,453.54 is: 66,689.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,690.30 : 193,061.27 = 44,453.54 : x
  2. Step 2: Convert to fraction form
    128,690.30/193,061.27 = 44,453.54/x
  3. Step 3: Cross multiply
    128,690.30x = 193,061.27 × 44,453.54
  4. Step 4: Simplify right side
    128,690.30x = 8,582,257,482.18
  5. Step 5: Solve for x
    x = 8,582,257,482.18/128,690.30
  6. Step 6: Final answer
    x = 66,689.23

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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.