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Finding the Fourth Proportional to 938, 1,299.98 and 923.60

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Solution

The fourth proportional to 938, 1,299.98 and 923.60 is: 1,280.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    938 : 1,299.98 = 923.60 : x
  2. Step 2: Convert to fraction form
    938/1,299.98 = 923.60/x
  3. Step 3: Cross multiply
    938x = 1,299.98 × 923.60
  4. Step 4: Simplify right side
    938x = 1,200,661.53
  5. Step 5: Solve for x
    x = 1,200,661.53/938
  6. Step 6: Final answer
    x = 1,280.02

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.