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Finding the Fourth Proportional to 20,993.98, 28,969.23 and 11,918.74

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Solution

The fourth proportional to 20,993.98, 28,969.23 and 11,918.74 is: 16,446.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,993.98 : 28,969.23 = 11,918.74 : x
  2. Step 2: Convert to fraction form
    20,993.98/28,969.23 = 11,918.74/x
  3. Step 3: Cross multiply
    20,993.98x = 28,969.23 × 11,918.74
  4. Step 4: Simplify right side
    20,993.98x = 345,276,720.37
  5. Step 5: Solve for x
    x = 345,276,720.37/20,993.98
  6. Step 6: Final answer
    x = 16,446.46

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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.