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Finding the Fourth Proportional to 28,422, 39,222.48 and 15,847.68

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Solution

The fourth proportional to 28,422, 39,222.48 and 15,847.68 is: 21,869.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,422 : 39,222.48 = 15,847.68 : x
  2. Step 2: Convert to fraction form
    28,422/39,222.48 = 15,847.68/x
  3. Step 3: Cross multiply
    28,422x = 39,222.48 × 15,847.68
  4. Step 4: Simplify right side
    28,422x = 621,585,311.85
  5. Step 5: Solve for x
    x = 621,585,311.85/28,422
  6. Step 6: Final answer
    x = 21,869.87

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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.