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Finding the Fourth Proportional to 418.79, 628.34 and 187.67

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Solution

The fourth proportional to 418.79, 628.34 and 187.67 is: 281.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.79 : 628.34 = 187.67 : x
  2. Step 2: Convert to fraction form
    418.79/628.34 = 187.67/x
  3. Step 3: Cross multiply
    418.79x = 628.34 × 187.67
  4. Step 4: Simplify right side
    418.79x = 117,919.63
  5. Step 5: Solve for x
    x = 117,919.63/418.79
  6. Step 6: Final answer
    x = 281.57

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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.