Home / 18,971.56-28,453.98-5,121.64

Finding the Fourth Proportional to 18,971.56, 28,453.98 and 5,121.64

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Solution

The fourth proportional to 18,971.56, 28,453.98 and 5,121.64 is: 7,681.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,971.56 : 28,453.98 = 5,121.64 : x
  2. Step 2: Convert to fraction form
    18,971.56/28,453.98 = 5,121.64/x
  3. Step 3: Cross multiply
    18,971.56x = 28,453.98 × 5,121.64
  4. Step 4: Simplify right side
    18,971.56x = 145,731,042.13
  5. Step 5: Solve for x
    x = 145,731,042.13/18,971.56
  6. Step 6: Final answer
    x = 7,681.55

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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.