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Finding the Fourth Proportional to 128,808.80, 193,213.20 and 35,314.40

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Solution

The fourth proportional to 128,808.80, 193,213.20 and 35,314.40 is: 52,971.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,808.80 : 193,213.20 = 35,314.40 : x
  2. Step 2: Convert to fraction form
    128,808.80/193,213.20 = 35,314.40/x
  3. Step 3: Cross multiply
    128,808.80x = 193,213.20 × 35,314.40
  4. Step 4: Simplify right side
    128,808.80x = 6,823,208,230.08
  5. Step 5: Solve for x
    x = 6,823,208,230.08/128,808.80
  6. Step 6: Final answer
    x = 52,971.60

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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.