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Finding the Fourth Proportional to 81,171.99, 111,809.16 and 57,256.74

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Solution

The fourth proportional to 81,171.99, 111,809.16 and 57,256.74 is: 78,867.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,171.99 : 111,809.16 = 57,256.74 : x
  2. Step 2: Convert to fraction form
    81,171.99/111,809.16 = 57,256.74/x
  3. Step 3: Cross multiply
    81,171.99x = 111,809.16 × 57,256.74
  4. Step 4: Simplify right side
    81,171.99x = 6,401,828,003.74
  5. Step 5: Solve for x
    x = 6,401,828,003.74/81,171.99
  6. Step 6: Final answer
    x = 78,867.45

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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.