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Finding the Fourth Proportional to 128,042.40, 192,063.60 and 80,695.20

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Solution

The fourth proportional to 128,042.40, 192,063.60 and 80,695.20 is: 121,042.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,042.40 : 192,063.60 = 80,695.20 : x
  2. Step 2: Convert to fraction form
    128,042.40/192,063.60 = 80,695.20/x
  3. Step 3: Cross multiply
    128,042.40x = 192,063.60 × 80,695.20
  4. Step 4: Simplify right side
    128,042.40x = 15,498,610,614.72
  5. Step 5: Solve for x
    x = 15,498,610,614.72/128,042.40
  6. Step 6: Final answer
    x = 121,042.80

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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.