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Finding the Fourth Proportional to 28,415.60, 42,629.80 and 16,722.80

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Solution

The fourth proportional to 28,415.60, 42,629.80 and 16,722.80 is: 25,087.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,415.60 : 42,629.80 = 16,722.80 : x
  2. Step 2: Convert to fraction form
    28,415.60/42,629.80 = 16,722.80/x
  3. Step 3: Cross multiply
    28,415.60x = 42,629.80 × 16,722.80
  4. Step 4: Simplify right side
    28,415.60x = 712,889,619.44
  5. Step 5: Solve for x
    x = 712,889,619.44/28,415.60
  6. Step 6: Final answer
    x = 25,087.97

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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.