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Finding the Fourth Proportional to 18,672.21, 28,016.82 and 6,986.34

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Solution

The fourth proportional to 18,672.21, 28,016.82 and 6,986.34 is: 10,482.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,672.21 : 28,016.82 = 6,986.34 : x
  2. Step 2: Convert to fraction form
    18,672.21/28,016.82 = 6,986.34/x
  3. Step 3: Cross multiply
    18,672.21x = 28,016.82 × 6,986.34
  4. Step 4: Simplify right side
    18,672.21x = 195,735,030.24
  5. Step 5: Solve for x
    x = 195,735,030.24/18,672.21
  6. Step 6: Final answer
    x = 10,482.69

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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.