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Finding the Fourth Proportional to 127,180.80, 190,771.20 and 80,486.40

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Solution

The fourth proportional to 127,180.80, 190,771.20 and 80,486.40 is: 120,729.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,180.80 : 190,771.20 = 80,486.40 : x
  2. Step 2: Convert to fraction form
    127,180.80/190,771.20 = 80,486.40/x
  3. Step 3: Cross multiply
    127,180.80x = 190,771.20 × 80,486.40
  4. Step 4: Simplify right side
    127,180.80x = 15,354,487,111.68
  5. Step 5: Solve for x
    x = 15,354,487,111.68/127,180.80
  6. Step 6: Final answer
    x = 120,729.60

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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.