Home / 128,089.05-191,912.13-99,634.83

Finding the Fourth Proportional to 128,089.05, 191,912.13 and 99,634.83

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Solution

The fourth proportional to 128,089.05, 191,912.13 and 99,634.83 is: 149,279.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,089.05 : 191,912.13 = 99,634.83 : x
  2. Step 2: Convert to fraction form
    128,089.05/191,912.13 = 99,634.83/x
  3. Step 3: Cross multiply
    128,089.05x = 191,912.13 × 99,634.83
  4. Step 4: Simplify right side
    128,089.05x = 19,121,132,447.49
  5. Step 5: Solve for x
    x = 19,121,132,447.49/128,089.05
  6. Step 6: Final answer
    x = 149,279.99

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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.