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Finding the Fourth Proportional to 192,128.40, 288,019.80 and 121,971.60

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Solution

The fourth proportional to 192,128.40, 288,019.80 and 121,971.60 is: 182,847.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    192,128.40 : 288,019.80 = 121,971.60 : x
  2. Step 2: Convert to fraction form
    192,128.40/288,019.80 = 121,971.60/x
  3. Step 3: Cross multiply
    192,128.40x = 288,019.80 × 121,971.60
  4. Step 4: Simplify right side
    192,128.40x = 35,130,235,837.68
  5. Step 5: Solve for x
    x = 35,130,235,837.68/192,128.40
  6. Step 6: Final answer
    x = 182,847.70

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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.