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Finding the Fourth Proportional to 133.78, 200.61 and 78.99

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Solution

The fourth proportional to 133.78, 200.61 and 78.99 is: 118.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.78 : 200.61 = 78.99 : x
  2. Step 2: Convert to fraction form
    133.78/200.61 = 78.99/x
  3. Step 3: Cross multiply
    133.78x = 200.61 × 78.99
  4. Step 4: Simplify right side
    133.78x = 15,846.18
  5. Step 5: Solve for x
    x = 15,846.18/133.78
  6. Step 6: Final answer
    x = 118.45

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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.