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Finding the Fourth Proportional to 30,991.72, 42,768.73 and 16,844.57

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Solution

The fourth proportional to 30,991.72, 42,768.73 and 16,844.57 is: 23,245.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,991.72 : 42,768.73 = 16,844.57 : x
  2. Step 2: Convert to fraction form
    30,991.72/42,768.73 = 16,844.57/x
  3. Step 3: Cross multiply
    30,991.72x = 42,768.73 × 16,844.57
  4. Step 4: Simplify right side
    30,991.72x = 720,420,568.23
  5. Step 5: Solve for x
    x = 720,420,568.23/30,991.72
  6. Step 6: Final answer
    x = 23,245.58

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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.