Home / 13,138.65-18,131.74-7,474.21

Finding the Fourth Proportional to 13,138.65, 18,131.74 and 7,474.21

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Solution

The fourth proportional to 13,138.65, 18,131.74 and 7,474.21 is: 10,314.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,138.65 : 18,131.74 = 7,474.21 : x
  2. Step 2: Convert to fraction form
    13,138.65/18,131.74 = 7,474.21/x
  3. Step 3: Cross multiply
    13,138.65x = 18,131.74 × 7,474.21
  4. Step 4: Simplify right side
    13,138.65x = 135,520,432.43
  5. Step 5: Solve for x
    x = 135,520,432.43/13,138.65
  6. Step 6: Final answer
    x = 10,314.64

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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.