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Finding the Fourth Proportional to 20,430.60, 30,796.80 and 18,745.80

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Solution

The fourth proportional to 20,430.60, 30,796.80 and 18,745.80 is: 28,257.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.60 : 30,796.80 = 18,745.80 : x
  2. Step 2: Convert to fraction form
    20,430.60/30,796.80 = 18,745.80/x
  3. Step 3: Cross multiply
    20,430.60x = 30,796.80 × 18,745.80
  4. Step 4: Simplify right side
    20,430.60x = 577,310,653.44
  5. Step 5: Solve for x
    x = 577,310,653.44/20,430.60
  6. Step 6: Final answer
    x = 28,257.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.