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Finding the Fourth Proportional to 289,693.60, 434,540.40 and 205,712.80

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Solution

The fourth proportional to 289,693.60, 434,540.40 and 205,712.80 is: 308,569.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,693.60 : 434,540.40 = 205,712.80 : x
  2. Step 2: Convert to fraction form
    289,693.60/434,540.40 = 205,712.80/x
  3. Step 3: Cross multiply
    289,693.60x = 434,540.40 × 205,712.80
  4. Step 4: Simplify right side
    289,693.60x = 89,390,522,397.12
  5. Step 5: Solve for x
    x = 89,390,522,397.12/289,693.60
  6. Step 6: Final answer
    x = 308,569.20

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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.