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Finding the Fourth Proportional to 12,388.80, 18,568.80 and 4,989.60

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Solution

The fourth proportional to 12,388.80, 18,568.80 and 4,989.60 is: 7,478.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,388.80 : 18,568.80 = 4,989.60 : x
  2. Step 2: Convert to fraction form
    12,388.80/18,568.80 = 4,989.60/x
  3. Step 3: Cross multiply
    12,388.80x = 18,568.80 × 4,989.60
  4. Step 4: Simplify right side
    12,388.80x = 92,650,884.48
  5. Step 5: Solve for x
    x = 92,650,884.48/12,388.80
  6. Step 6: Final answer
    x = 7,478.60

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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.