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Finding the Fourth Proportional to 20,480.60, 30,720.90 and 12,704.60

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Solution

The fourth proportional to 20,480.60, 30,720.90 and 12,704.60 is: 19,056.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,480.60 : 30,720.90 = 12,704.60 : x
  2. Step 2: Convert to fraction form
    20,480.60/30,720.90 = 12,704.60/x
  3. Step 3: Cross multiply
    20,480.60x = 30,720.90 × 12,704.60
  4. Step 4: Simplify right side
    20,480.60x = 390,296,746.14
  5. Step 5: Solve for x
    x = 390,296,746.14/20,480.60
  6. Step 6: Final answer
    x = 19,056.90

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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.