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Finding the Fourth Proportional to 1,330.73, 1,992.57 and 938.60

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Solution

The fourth proportional to 1,330.73, 1,992.57 and 938.60 is: 1,405.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.73 : 1,992.57 = 938.60 : x
  2. Step 2: Convert to fraction form
    1,330.73/1,992.57 = 938.60/x
  3. Step 3: Cross multiply
    1,330.73x = 1,992.57 × 938.60
  4. Step 4: Simplify right side
    1,330.73x = 1,870,216.24
  5. Step 5: Solve for x
    x = 1,870,216.24/1,330.73
  6. Step 6: Final answer
    x = 1,405.41

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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.