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Finding the Fourth Proportional to 133.78, 200.74 and 72.94

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Solution

The fourth proportional to 133.78, 200.74 and 72.94 is: 109.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.78 : 200.74 = 72.94 : x
  2. Step 2: Convert to fraction form
    133.78/200.74 = 72.94/x
  3. Step 3: Cross multiply
    133.78x = 200.74 × 72.94
  4. Step 4: Simplify right side
    133.78x = 14,641.98
  5. Step 5: Solve for x
    x = 14,641.98/133.78
  6. Step 6: Final answer
    x = 109.45

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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.