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Finding the Fourth Proportional to 18,918.26, 28,377.44 and 18,890.92

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Solution

The fourth proportional to 18,918.26, 28,377.44 and 18,890.92 is: 28,336.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.26 : 28,377.44 = 18,890.92 : x
  2. Step 2: Convert to fraction form
    18,918.26/28,377.44 = 18,890.92/x
  3. Step 3: Cross multiply
    18,918.26x = 28,377.44 × 18,890.92
  4. Step 4: Simplify right side
    18,918.26x = 536,075,960.70
  5. Step 5: Solve for x
    x = 536,075,960.70/18,918.26
  6. Step 6: Final answer
    x = 28,336.43

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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.