Home / 13,138.21-18,130.70-8,422.49

Finding the Fourth Proportional to 13,138.21, 18,130.70 and 8,422.49

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Solution

The fourth proportional to 13,138.21, 18,130.70 and 8,422.49 is: 11,623.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,138.21 : 18,130.70 = 8,422.49 : x
  2. Step 2: Convert to fraction form
    13,138.21/18,130.70 = 8,422.49/x
  3. Step 3: Cross multiply
    13,138.21x = 18,130.70 × 8,422.49
  4. Step 4: Simplify right side
    13,138.21x = 152,705,639.44
  5. Step 5: Solve for x
    x = 152,705,639.44/13,138.21
  6. Step 6: Final answer
    x = 11,623.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.