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Finding the Fourth Proportional to 209,654.10, 289,284.20 and 123,640.06

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Solution

The fourth proportional to 209,654.10, 289,284.20 and 123,640.06 is: 170,600.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,654.10 : 289,284.20 = 123,640.06 : x
  2. Step 2: Convert to fraction form
    209,654.10/289,284.20 = 123,640.06/x
  3. Step 3: Cross multiply
    209,654.10x = 289,284.20 × 123,640.06
  4. Step 4: Simplify right side
    209,654.10x = 35,767,115,845.05
  5. Step 5: Solve for x
    x = 35,767,115,845.05/209,654.10
  6. Step 6: Final answer
    x = 170,600.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.