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Finding the Fourth Proportional to 206,639.40, 309,959.10 and 66,412.20

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Solution

The fourth proportional to 206,639.40, 309,959.10 and 66,412.20 is: 99,618.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,639.40 : 309,959.10 = 66,412.20 : x
  2. Step 2: Convert to fraction form
    206,639.40/309,959.10 = 66,412.20/x
  3. Step 3: Cross multiply
    206,639.40x = 309,959.10 × 66,412.20
  4. Step 4: Simplify right side
    206,639.40x = 20,585,065,741.02
  5. Step 5: Solve for x
    x = 20,585,065,741.02/206,639.40
  6. Step 6: Final answer
    x = 99,618.30

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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.