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Finding the Fourth Proportional to 20,618.79, 30,907.31 and 8,147.64

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Solution

The fourth proportional to 20,618.79, 30,907.31 and 8,147.64 is: 12,213.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,618.79 : 30,907.31 = 8,147.64 : x
  2. Step 2: Convert to fraction form
    20,618.79/30,907.31 = 8,147.64/x
  3. Step 3: Cross multiply
    20,618.79x = 30,907.31 × 8,147.64
  4. Step 4: Simplify right side
    20,618.79x = 251,821,594.51
  5. Step 5: Solve for x
    x = 251,821,594.51/20,618.79
  6. Step 6: Final answer
    x = 12,213.21

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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.