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Finding the Fourth Proportional to 30,991.55, 42,768.02 and 16,844.30

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Solution

The fourth proportional to 30,991.55, 42,768.02 and 16,844.30 is: 23,244.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,991.55 : 42,768.02 = 16,844.30 : x
  2. Step 2: Convert to fraction form
    30,991.55/42,768.02 = 16,844.30/x
  3. Step 3: Cross multiply
    30,991.55x = 42,768.02 × 16,844.30
  4. Step 4: Simplify right side
    30,991.55x = 720,397,187.56
  5. Step 5: Solve for x
    x = 720,397,187.56/30,991.55
  6. Step 6: Final answer
    x = 23,244.95

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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.