Home / 14,121.20-21,138.60-8,260.40

Finding the Fourth Proportional to 14,121.20, 21,138.60 and 8,260.40

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Solution

The fourth proportional to 14,121.20, 21,138.60 and 8,260.40 is: 12,365.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,121.20 : 21,138.60 = 8,260.40 : x
  2. Step 2: Convert to fraction form
    14,121.20/21,138.60 = 8,260.40/x
  3. Step 3: Cross multiply
    14,121.20x = 21,138.60 × 8,260.40
  4. Step 4: Simplify right side
    14,121.20x = 174,613,291.44
  5. Step 5: Solve for x
    x = 174,613,291.44/14,121.20
  6. Step 6: Final answer
    x = 12,365.33

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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.