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Finding the Fourth Proportional to 128,365.90, 192,030.45 and 111,028.30

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Solution

The fourth proportional to 128,365.90, 192,030.45 and 111,028.30 is: 166,094.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,365.90 : 192,030.45 = 111,028.30 : x
  2. Step 2: Convert to fraction form
    128,365.90/192,030.45 = 111,028.30/x
  3. Step 3: Cross multiply
    128,365.90x = 192,030.45 × 111,028.30
  4. Step 4: Simplify right side
    128,365.90x = 21,320,814,411.74
  5. Step 5: Solve for x
    x = 21,320,814,411.74/128,365.90
  6. Step 6: Final answer
    x = 166,094.07

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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.