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Finding the Fourth Proportional to 428.36, 642.53 and 185.09

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Solution

The fourth proportional to 428.36, 642.53 and 185.09 is: 277.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.36 : 642.53 = 185.09 : x
  2. Step 2: Convert to fraction form
    428.36/642.53 = 185.09/x
  3. Step 3: Cross multiply
    428.36x = 642.53 × 185.09
  4. Step 4: Simplify right side
    428.36x = 118,923.13
  5. Step 5: Solve for x
    x = 118,923.13/428.36
  6. Step 6: Final answer
    x = 277.63

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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.