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Finding the Fourth Proportional to 644.94, 967.86 and 428.58

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Solution

The fourth proportional to 644.94, 967.86 and 428.58 is: 643.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.94 : 967.86 = 428.58 : x
  2. Step 2: Convert to fraction form
    644.94/967.86 = 428.58/x
  3. Step 3: Cross multiply
    644.94x = 967.86 × 428.58
  4. Step 4: Simplify right side
    644.94x = 414,805.44
  5. Step 5: Solve for x
    x = 414,805.44/644.94
  6. Step 6: Final answer
    x = 643.17

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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.