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Finding the Fourth Proportional to 128,112.40, 192,168.60 and 121,988.80

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Solution

The fourth proportional to 128,112.40, 192,168.60 and 121,988.80 is: 182,983.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,112.40 : 192,168.60 = 121,988.80 : x
  2. Step 2: Convert to fraction form
    128,112.40/192,168.60 = 121,988.80/x
  3. Step 3: Cross multiply
    128,112.40x = 192,168.60 × 121,988.80
  4. Step 4: Simplify right side
    128,112.40x = 23,442,416,911.68
  5. Step 5: Solve for x
    x = 23,442,416,911.68/128,112.40
  6. Step 6: Final answer
    x = 182,983.20

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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.