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Finding the Fourth Proportional to 30,991.59, 42,768.56 and 16,844.45

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Solution

The fourth proportional to 30,991.59, 42,768.56 and 16,844.45 is: 23,245.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,991.59 : 42,768.56 = 16,844.45 : x
  2. Step 2: Convert to fraction form
    30,991.59/42,768.56 = 16,844.45/x
  3. Step 3: Cross multiply
    30,991.59x = 42,768.56 × 16,844.45
  4. Step 4: Simplify right side
    30,991.59x = 720,412,572.43
  5. Step 5: Solve for x
    x = 720,412,572.43/30,991.59
  6. Step 6: Final answer
    x = 23,245.42

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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.