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Finding the Fourth Proportional to 133.58, 200.40 and 68.72

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Solution

The fourth proportional to 133.58, 200.40 and 68.72 is: 103.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.58 : 200.40 = 68.72 : x
  2. Step 2: Convert to fraction form
    133.58/200.40 = 68.72/x
  3. Step 3: Cross multiply
    133.58x = 200.40 × 68.72
  4. Step 4: Simplify right side
    133.58x = 13,771.49
  5. Step 5: Solve for x
    x = 13,771.49/133.58
  6. Step 6: Final answer
    x = 103.10

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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.