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Finding the Fourth Proportional to 194.94, 268.80 and 142.80

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Solution

The fourth proportional to 194.94, 268.80 and 142.80 is: 196.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.94 : 268.80 = 142.80 : x
  2. Step 2: Convert to fraction form
    194.94/268.80 = 142.80/x
  3. Step 3: Cross multiply
    194.94x = 268.80 × 142.80
  4. Step 4: Simplify right side
    194.94x = 38,384.64
  5. Step 5: Solve for x
    x = 38,384.64/194.94
  6. Step 6: Final answer
    x = 196.90

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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.