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Finding the Fourth Proportional to 218,720.80, 328,081.20 and 197,293.60

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Solution

The fourth proportional to 218,720.80, 328,081.20 and 197,293.60 is: 295,940.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,720.80 : 328,081.20 = 197,293.60 : x
  2. Step 2: Convert to fraction form
    218,720.80/328,081.20 = 197,293.60/x
  3. Step 3: Cross multiply
    218,720.80x = 328,081.20 × 197,293.60
  4. Step 4: Simplify right side
    218,720.80x = 64,728,321,040.32
  5. Step 5: Solve for x
    x = 64,728,321,040.32/218,720.80
  6. Step 6: Final answer
    x = 295,940.40

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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.