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Finding the Fourth Proportional to 128,287.80, 192,431.70 and 122,164.20

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Solution

The fourth proportional to 128,287.80, 192,431.70 and 122,164.20 is: 183,246.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,287.80 : 192,431.70 = 122,164.20 : x
  2. Step 2: Convert to fraction form
    128,287.80/192,431.70 = 122,164.20/x
  3. Step 3: Cross multiply
    128,287.80x = 192,431.70 × 122,164.20
  4. Step 4: Simplify right side
    128,287.80x = 23,508,264,685.14
  5. Step 5: Solve for x
    x = 23,508,264,685.14/128,287.80
  6. Step 6: Final answer
    x = 183,246.30

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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.