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Finding the Fourth Proportional to 28,491.80, 42,770.10 and 16,811.60

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Solution

The fourth proportional to 28,491.80, 42,770.10 and 16,811.60 is: 25,236.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,491.80 : 42,770.10 = 16,811.60 : x
  2. Step 2: Convert to fraction form
    28,491.80/42,770.10 = 16,811.60/x
  3. Step 3: Cross multiply
    28,491.80x = 42,770.10 × 16,811.60
  4. Step 4: Simplify right side
    28,491.80x = 719,033,813.16
  5. Step 5: Solve for x
    x = 719,033,813.16/28,491.80
  6. Step 6: Final answer
    x = 25,236.52

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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.