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Finding the Fourth Proportional to 428.66, 642.47 and 197.22

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Solution

The fourth proportional to 428.66, 642.47 and 197.22 is: 295.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.66 : 642.47 = 197.22 : x
  2. Step 2: Convert to fraction form
    428.66/642.47 = 197.22/x
  3. Step 3: Cross multiply
    428.66x = 642.47 × 197.22
  4. Step 4: Simplify right side
    428.66x = 126,709.36
  5. Step 5: Solve for x
    x = 126,709.36/428.66
  6. Step 6: Final answer
    x = 295.59

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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.