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Finding the Fourth Proportional to 28,868.76, 39,839 and 15,620.76

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Solution

The fourth proportional to 28,868.76, 39,839 and 15,620.76 is: 21,556.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,868.76 : 39,839 = 15,620.76 : x
  2. Step 2: Convert to fraction form
    28,868.76/39,839 = 15,620.76/x
  3. Step 3: Cross multiply
    28,868.76x = 39,839 × 15,620.76
  4. Step 4: Simplify right side
    28,868.76x = 622,315,457.64
  5. Step 5: Solve for x
    x = 622,315,457.64/28,868.76
  6. Step 6: Final answer
    x = 21,556.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.