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Finding the Fourth Proportional to 80,978.40, 121,467.60 and 75,729.60

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Solution

The fourth proportional to 80,978.40, 121,467.60 and 75,729.60 is: 113,594.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,978.40 : 121,467.60 = 75,729.60 : x
  2. Step 2: Convert to fraction form
    80,978.40/121,467.60 = 75,729.60/x
  3. Step 3: Cross multiply
    80,978.40x = 121,467.60 × 75,729.60
  4. Step 4: Simplify right side
    80,978.40x = 9,198,692,760.96
  5. Step 5: Solve for x
    x = 9,198,692,760.96/80,978.40
  6. Step 6: Final answer
    x = 113,594.40

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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.