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Finding the Fourth Proportional to 425.21, 637.94 and 136.67

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Solution

The fourth proportional to 425.21, 637.94 and 136.67 is: 205.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.21 : 637.94 = 136.67 : x
  2. Step 2: Convert to fraction form
    425.21/637.94 = 136.67/x
  3. Step 3: Cross multiply
    425.21x = 637.94 × 136.67
  4. Step 4: Simplify right side
    425.21x = 87,187.26
  5. Step 5: Solve for x
    x = 87,187.26/425.21
  6. Step 6: Final answer
    x = 205.05

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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.