Home / 128,081.17-191,728.09-109,185.49

Finding the Fourth Proportional to 128,081.17, 191,728.09 and 109,185.49

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Solution

The fourth proportional to 128,081.17, 191,728.09 and 109,185.49 is: 163,442.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,081.17 : 191,728.09 = 109,185.49 : x
  2. Step 2: Convert to fraction form
    128,081.17/191,728.09 = 109,185.49/x
  3. Step 3: Cross multiply
    128,081.17x = 191,728.09 × 109,185.49
  4. Step 4: Simplify right side
    128,081.17x = 20,933,925,453.41
  5. Step 5: Solve for x
    x = 20,933,925,453.41/128,081.17
  6. Step 6: Final answer
    x = 163,442.65

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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.