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Finding the Fourth Proportional to 128,919.40, 193,427.70 and 62,418.40

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Solution

The fourth proportional to 128,919.40, 193,427.70 and 62,418.40 is: 93,651.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,919.40 : 193,427.70 = 62,418.40 : x
  2. Step 2: Convert to fraction form
    128,919.40/193,427.70 = 62,418.40/x
  3. Step 3: Cross multiply
    128,919.40x = 193,427.70 × 62,418.40
  4. Step 4: Simplify right side
    128,919.40x = 12,073,447,549.68
  5. Step 5: Solve for x
    x = 12,073,447,549.68/128,919.40
  6. Step 6: Final answer
    x = 93,651.13

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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.