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Finding the Fourth Proportional to 172,283.10, 257,914.35 and 128,105.70

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Solution

The fourth proportional to 172,283.10, 257,914.35 and 128,105.70 is: 191,779.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,283.10 : 257,914.35 = 128,105.70 : x
  2. Step 2: Convert to fraction form
    172,283.10/257,914.35 = 128,105.70/x
  3. Step 3: Cross multiply
    172,283.10x = 257,914.35 × 128,105.70
  4. Step 4: Simplify right side
    172,283.10x = 33,040,298,346.80
  5. Step 5: Solve for x
    x = 33,040,298,346.80/172,283.10
  6. Step 6: Final answer
    x = 191,779.10

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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.