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Finding the Fourth Proportional to 12,783.14, 17,639.16 and 7,116.47

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Solution

The fourth proportional to 12,783.14, 17,639.16 and 7,116.47 is: 9,819.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,783.14 : 17,639.16 = 7,116.47 : x
  2. Step 2: Convert to fraction form
    12,783.14/17,639.16 = 7,116.47/x
  3. Step 3: Cross multiply
    12,783.14x = 17,639.16 × 7,116.47
  4. Step 4: Simplify right side
    12,783.14x = 125,528,552.97
  5. Step 5: Solve for x
    x = 125,528,552.97/12,783.14
  6. Step 6: Final answer
    x = 9,819.85

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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.