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Finding the Fourth Proportional to 128,020.80, 191,800.80 and 109,588.80

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Solution

The fourth proportional to 128,020.80, 191,800.80 and 109,588.80 is: 164,185.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,020.80 : 191,800.80 = 109,588.80 : x
  2. Step 2: Convert to fraction form
    128,020.80/191,800.80 = 109,588.80/x
  3. Step 3: Cross multiply
    128,020.80x = 191,800.80 × 109,588.80
  4. Step 4: Simplify right side
    128,020.80x = 21,019,219,511.04
  5. Step 5: Solve for x
    x = 21,019,219,511.04/128,020.80
  6. Step 6: Final answer
    x = 164,185.97

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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.