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Finding the Fourth Proportional to 128,838.80, 193,258.20 and 108,102.80

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Solution

The fourth proportional to 128,838.80, 193,258.20 and 108,102.80 is: 162,154.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,838.80 : 193,258.20 = 108,102.80 : x
  2. Step 2: Convert to fraction form
    128,838.80/193,258.20 = 108,102.80/x
  3. Step 3: Cross multiply
    128,838.80x = 193,258.20 × 108,102.80
  4. Step 4: Simplify right side
    128,838.80x = 20,891,752,542.96
  5. Step 5: Solve for x
    x = 20,891,752,542.96/128,838.80
  6. Step 6: Final answer
    x = 162,154.20

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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.