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Finding the Fourth Proportional to 128,471.74, 192,706.54 and 100,415.37

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Solution

The fourth proportional to 128,471.74, 192,706.54 and 100,415.37 is: 150,622.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,471.74 : 192,706.54 = 100,415.37 : x
  2. Step 2: Convert to fraction form
    128,471.74/192,706.54 = 100,415.37/x
  3. Step 3: Cross multiply
    128,471.74x = 192,706.54 × 100,415.37
  4. Step 4: Simplify right side
    128,471.74x = 19,350,698,987.13
  5. Step 5: Solve for x
    x = 19,350,698,987.13/128,471.74
  6. Step 6: Final answer
    x = 150,622.23

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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.