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Finding the Fourth Proportional to 20,293.60, 30,418.80 and 7,808.80

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Solution

The fourth proportional to 20,293.60, 30,418.80 and 7,808.80 is: 11,704.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,293.60 : 30,418.80 = 7,808.80 : x
  2. Step 2: Convert to fraction form
    20,293.60/30,418.80 = 7,808.80/x
  3. Step 3: Cross multiply
    20,293.60x = 30,418.80 × 7,808.80
  4. Step 4: Simplify right side
    20,293.60x = 237,534,325.44
  5. Step 5: Solve for x
    x = 237,534,325.44/20,293.60
  6. Step 6: Final answer
    x = 11,704.89

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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.