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Finding the Fourth Proportional to 1,330.24, 1,992.20 and 1,138

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Solution

The fourth proportional to 1,330.24, 1,992.20 and 1,138 is: 1,704.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.24 : 1,992.20 = 1,138 : x
  2. Step 2: Convert to fraction form
    1,330.24/1,992.20 = 1,138/x
  3. Step 3: Cross multiply
    1,330.24x = 1,992.20 × 1,138
  4. Step 4: Simplify right side
    1,330.24x = 2,267,123.60
  5. Step 5: Solve for x
    x = 2,267,123.60/1,330.24
  6. Step 6: Final answer
    x = 1,704.30

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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.