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Finding the Fourth Proportional to 984.89, 1,476.34 and 638.44

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Solution

The fourth proportional to 984.89, 1,476.34 and 638.44 is: 957.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.89 : 1,476.34 = 638.44 : x
  2. Step 2: Convert to fraction form
    984.89/1,476.34 = 638.44/x
  3. Step 3: Cross multiply
    984.89x = 1,476.34 × 638.44
  4. Step 4: Simplify right side
    984.89x = 942,560.50
  5. Step 5: Solve for x
    x = 942,560.50/984.89
  6. Step 6: Final answer
    x = 957.02

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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.