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Finding the Fourth Proportional to 127,138.20, 190,793.70 and 70,978.20

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Solution

The fourth proportional to 127,138.20, 190,793.70 and 70,978.20 is: 106,515.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,138.20 : 190,793.70 = 70,978.20 : x
  2. Step 2: Convert to fraction form
    127,138.20/190,793.70 = 70,978.20/x
  3. Step 3: Cross multiply
    127,138.20x = 190,793.70 × 70,978.20
  4. Step 4: Simplify right side
    127,138.20x = 13,542,193,397.34
  5. Step 5: Solve for x
    x = 13,542,193,397.34/127,138.20
  6. Step 6: Final answer
    x = 106,515.54

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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.