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Finding the Fourth Proportional to 133.04, 199.38 and 68.78

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Solution

The fourth proportional to 133.04, 199.38 and 68.78 is: 103.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.04 : 199.38 = 68.78 : x
  2. Step 2: Convert to fraction form
    133.04/199.38 = 68.78/x
  3. Step 3: Cross multiply
    133.04x = 199.38 × 68.78
  4. Step 4: Simplify right side
    133.04x = 13,713.36
  5. Step 5: Solve for x
    x = 13,713.36/133.04
  6. Step 6: Final answer
    x = 103.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.