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Finding the Fourth Proportional to 127,220.40, 190,830.60 and 80,679.60

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Solution

The fourth proportional to 127,220.40, 190,830.60 and 80,679.60 is: 121,019.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,220.40 : 190,830.60 = 80,679.60 : x
  2. Step 2: Convert to fraction form
    127,220.40/190,830.60 = 80,679.60/x
  3. Step 3: Cross multiply
    127,220.40x = 190,830.60 × 80,679.60
  4. Step 4: Simplify right side
    127,220.40x = 15,396,136,475.76
  5. Step 5: Solve for x
    x = 15,396,136,475.76/127,220.40
  6. Step 6: Final answer
    x = 121,019.40

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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.