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Finding the Fourth Proportional to 28,759.88, 39,682.51 and 16,820.88

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Solution

The fourth proportional to 28,759.88, 39,682.51 and 16,820.88 is: 23,209.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,759.88 : 39,682.51 = 16,820.88 : x
  2. Step 2: Convert to fraction form
    28,759.88/39,682.51 = 16,820.88/x
  3. Step 3: Cross multiply
    28,759.88x = 39,682.51 × 16,820.88
  4. Step 4: Simplify right side
    28,759.88x = 667,494,795.96
  5. Step 5: Solve for x
    x = 667,494,795.96/28,759.88
  6. Step 6: Final answer
    x = 23,209.24

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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.