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Finding the Fourth Proportional to 30,991.76, 42,768.91 and 16,844.64

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Solution

The fourth proportional to 30,991.76, 42,768.91 and 16,844.64 is: 23,245.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,991.76 : 42,768.91 = 16,844.64 : x
  2. Step 2: Convert to fraction form
    30,991.76/42,768.91 = 16,844.64/x
  3. Step 3: Cross multiply
    30,991.76x = 42,768.91 × 16,844.64
  4. Step 4: Simplify right side
    30,991.76x = 720,426,892.14
  5. Step 5: Solve for x
    x = 720,426,892.14/30,991.76
  6. Step 6: Final answer
    x = 23,245.76

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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.