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Finding the Fourth Proportional to 207,720.60, 311,580.90 and 128,578.20

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Solution

The fourth proportional to 207,720.60, 311,580.90 and 128,578.20 is: 192,867.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,720.60 : 311,580.90 = 128,578.20 : x
  2. Step 2: Convert to fraction form
    207,720.60/311,580.90 = 128,578.20/x
  3. Step 3: Cross multiply
    207,720.60x = 311,580.90 × 128,578.20
  4. Step 4: Simplify right side
    207,720.60x = 40,062,511,276.38
  5. Step 5: Solve for x
    x = 40,062,511,276.38/207,720.60
  6. Step 6: Final answer
    x = 192,867.30

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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.