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Finding the Fourth Proportional to 930.54, 1,395.36 and 638.49

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Solution

The fourth proportional to 930.54, 1,395.36 and 638.49 is: 957.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.54 : 1,395.36 = 638.49 : x
  2. Step 2: Convert to fraction form
    930.54/1,395.36 = 638.49/x
  3. Step 3: Cross multiply
    930.54x = 1,395.36 × 638.49
  4. Step 4: Simplify right side
    930.54x = 890,923.41
  5. Step 5: Solve for x
    x = 890,923.41/930.54
  6. Step 6: Final answer
    x = 957.43

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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.