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Finding the Fourth Proportional to 428.97, 643.35 and 246.27

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Solution

The fourth proportional to 428.97, 643.35 and 246.27 is: 369.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.97 : 643.35 = 246.27 : x
  2. Step 2: Convert to fraction form
    428.97/643.35 = 246.27/x
  3. Step 3: Cross multiply
    428.97x = 643.35 × 246.27
  4. Step 4: Simplify right side
    428.97x = 158,436.20
  5. Step 5: Solve for x
    x = 158,436.20/428.97
  6. Step 6: Final answer
    x = 369.34

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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.