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Finding the Fourth Proportional to 18,805.51, 28,212.94 and 13,269.67

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Solution

The fourth proportional to 18,805.51, 28,212.94 and 13,269.67 is: 19,907.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,805.51 : 28,212.94 = 13,269.67 : x
  2. Step 2: Convert to fraction form
    18,805.51/28,212.94 = 13,269.67/x
  3. Step 3: Cross multiply
    18,805.51x = 28,212.94 × 13,269.67
  4. Step 4: Simplify right side
    18,805.51x = 374,376,403.53
  5. Step 5: Solve for x
    x = 374,376,403.53/18,805.51
  6. Step 6: Final answer
    x = 19,907.80

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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.