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Finding the Fourth Proportional to 13,121.22, 19,605.03 and 12,661.86

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Solution

The fourth proportional to 13,121.22, 19,605.03 and 12,661.86 is: 18,918.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.22 : 19,605.03 = 12,661.86 : x
  2. Step 2: Convert to fraction form
    13,121.22/19,605.03 = 12,661.86/x
  3. Step 3: Cross multiply
    13,121.22x = 19,605.03 × 12,661.86
  4. Step 4: Simplify right side
    13,121.22x = 248,236,145.16
  5. Step 5: Solve for x
    x = 248,236,145.16/13,121.22
  6. Step 6: Final answer
    x = 18,918.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.