Home / 18,729.12-28,099.68-13,112.64

Finding the Fourth Proportional to 18,729.12, 28,099.68 and 13,112.64

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Solution

The fourth proportional to 18,729.12, 28,099.68 and 13,112.64 is: 19,673.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,729.12 : 28,099.68 = 13,112.64 : x
  2. Step 2: Convert to fraction form
    18,729.12/28,099.68 = 13,112.64/x
  3. Step 3: Cross multiply
    18,729.12x = 28,099.68 × 13,112.64
  4. Step 4: Simplify right side
    18,729.12x = 368,460,987.96
  5. Step 5: Solve for x
    x = 368,460,987.96/18,729.12
  6. Step 6: Final answer
    x = 19,673.16

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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.