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Finding the Fourth Proportional to 67.21, 100.25 and 63.47

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Solution

The fourth proportional to 67.21, 100.25 and 63.47 is: 94.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.21 : 100.25 = 63.47 : x
  2. Step 2: Convert to fraction form
    67.21/100.25 = 63.47/x
  3. Step 3: Cross multiply
    67.21x = 100.25 × 63.47
  4. Step 4: Simplify right side
    67.21x = 6,362.55
  5. Step 5: Solve for x
    x = 6,362.55/67.21
  6. Step 6: Final answer
    x = 94.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.