Home / 13,121.16-18,115.74-10,131.72

Finding the Fourth Proportional to 13,121.16, 18,115.74 and 10,131.72

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Solution

The fourth proportional to 13,121.16, 18,115.74 and 10,131.72 is: 13,988.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.16 : 18,115.74 = 10,131.72 : x
  2. Step 2: Convert to fraction form
    13,121.16/18,115.74 = 10,131.72/x
  3. Step 3: Cross multiply
    13,121.16x = 18,115.74 × 10,131.72
  4. Step 4: Simplify right side
    13,121.16x = 183,543,605.27
  5. Step 5: Solve for x
    x = 183,543,605.27/13,121.16
  6. Step 6: Final answer
    x = 13,988.37

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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.