Home / 128,236.78-192,394.05-90,869.25

Finding the Fourth Proportional to 128,236.78, 192,394.05 and 90,869.25

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Solution

The fourth proportional to 128,236.78, 192,394.05 and 90,869.25 is: 136,331.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,236.78 : 192,394.05 = 90,869.25 : x
  2. Step 2: Convert to fraction form
    128,236.78/192,394.05 = 90,869.25/x
  3. Step 3: Cross multiply
    128,236.78x = 192,394.05 × 90,869.25
  4. Step 4: Simplify right side
    128,236.78x = 17,482,703,027.96
  5. Step 5: Solve for x
    x = 17,482,703,027.96/128,236.78
  6. Step 6: Final answer
    x = 136,331.43

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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.