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Finding the Fourth Proportional to 428.29, 642.33 and 184.61

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Solution

The fourth proportional to 428.29, 642.33 and 184.61 is: 276.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.29 : 642.33 = 184.61 : x
  2. Step 2: Convert to fraction form
    428.29/642.33 = 184.61/x
  3. Step 3: Cross multiply
    428.29x = 642.33 × 184.61
  4. Step 4: Simplify right side
    428.29x = 118,580.54
  5. Step 5: Solve for x
    x = 118,580.54/428.29
  6. Step 6: Final answer
    x = 276.87

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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.