Home / 12,405.20-18,622.20-7,480.40

Finding the Fourth Proportional to 12,405.20, 18,622.20 and 7,480.40

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Solution

The fourth proportional to 12,405.20, 18,622.20 and 7,480.40 is: 11,229.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,405.20 : 18,622.20 = 7,480.40 : x
  2. Step 2: Convert to fraction form
    12,405.20/18,622.20 = 7,480.40/x
  3. Step 3: Cross multiply
    12,405.20x = 18,622.20 × 7,480.40
  4. Step 4: Simplify right side
    12,405.20x = 139,301,504.88
  5. Step 5: Solve for x
    x = 139,301,504.88/12,405.20
  6. Step 6: Final answer
    x = 11,229.28

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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.