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Finding the Fourth Proportional to 12,635.20, 18,958.20 and 7,958.80

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Solution

The fourth proportional to 12,635.20, 18,958.20 and 7,958.80 is: 11,941.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,635.20 : 18,958.20 = 7,958.80 : x
  2. Step 2: Convert to fraction form
    12,635.20/18,958.20 = 7,958.80/x
  3. Step 3: Cross multiply
    12,635.20x = 18,958.20 × 7,958.80
  4. Step 4: Simplify right side
    12,635.20x = 150,884,522.16
  5. Step 5: Solve for x
    x = 150,884,522.16/12,635.20
  6. Step 6: Final answer
    x = 11,941.60

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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.