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Finding the Fourth Proportional to 18,890.65, 28,315.19 and 7,791.27

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Solution

The fourth proportional to 18,890.65, 28,315.19 and 7,791.27 is: 11,678.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,890.65 : 28,315.19 = 7,791.27 : x
  2. Step 2: Convert to fraction form
    18,890.65/28,315.19 = 7,791.27/x
  3. Step 3: Cross multiply
    18,890.65x = 28,315.19 × 7,791.27
  4. Step 4: Simplify right side
    18,890.65x = 220,611,290.39
  5. Step 5: Solve for x
    x = 220,611,290.39/18,890.65
  6. Step 6: Final answer
    x = 11,678.33

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1.5x scale

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.