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Finding the Fourth Proportional to 18,691.40, 28,047.90 and 7,005.80

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Solution

The fourth proportional to 18,691.40, 28,047.90 and 7,005.80 is: 10,512.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,691.40 : 28,047.90 = 7,005.80 : x
  2. Step 2: Convert to fraction form
    18,691.40/28,047.90 = 7,005.80/x
  3. Step 3: Cross multiply
    18,691.40x = 28,047.90 × 7,005.80
  4. Step 4: Simplify right side
    18,691.40x = 196,497,977.82
  5. Step 5: Solve for x
    x = 196,497,977.82/18,691.40
  6. Step 6: Final answer
    x = 10,512.75

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.