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Finding the Fourth Proportional to 418.53, 628.10 and 187.68

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Solution

The fourth proportional to 418.53, 628.10 and 187.68 is: 281.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.53 : 628.10 = 187.68 : x
  2. Step 2: Convert to fraction form
    418.53/628.10 = 187.68/x
  3. Step 3: Cross multiply
    418.53x = 628.10 × 187.68
  4. Step 4: Simplify right side
    418.53x = 117,880.87
  5. Step 5: Solve for x
    x = 117,880.87/418.53
  6. Step 6: Final answer
    x = 281.65

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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.