Home / 128,028.20-192,042.30-81,314.60

Finding the Fourth Proportional to 128,028.20, 192,042.30 and 81,314.60

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Solution

The fourth proportional to 128,028.20, 192,042.30 and 81,314.60 is: 121,971.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,028.20 : 192,042.30 = 81,314.60 : x
  2. Step 2: Convert to fraction form
    128,028.20/192,042.30 = 81,314.60/x
  3. Step 3: Cross multiply
    128,028.20x = 192,042.30 × 81,314.60
  4. Step 4: Simplify right side
    128,028.20x = 15,615,842,807.58
  5. Step 5: Solve for x
    x = 15,615,842,807.58/128,028.20
  6. Step 6: Final answer
    x = 121,971.90

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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.