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Finding the Fourth Proportional to 128,251.80, 192,377.70 and 122,128.20

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Solution

The fourth proportional to 128,251.80, 192,377.70 and 122,128.20 is: 183,192.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,251.80 : 192,377.70 = 122,128.20 : x
  2. Step 2: Convert to fraction form
    128,251.80/192,377.70 = 122,128.20/x
  3. Step 3: Cross multiply
    128,251.80x = 192,377.70 × 122,128.20
  4. Step 4: Simplify right side
    128,251.80x = 23,494,742,221.14
  5. Step 5: Solve for x
    x = 23,494,742,221.14/128,251.80
  6. Step 6: Final answer
    x = 183,192.30

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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.