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Finding the Fourth Proportional to 1,288.21, 1,932.23 and 738.67

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Solution

The fourth proportional to 1,288.21, 1,932.23 and 738.67 is: 1,107.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.21 : 1,932.23 = 738.67 : x
  2. Step 2: Convert to fraction form
    1,288.21/1,932.23 = 738.67/x
  3. Step 3: Cross multiply
    1,288.21x = 1,932.23 × 738.67
  4. Step 4: Simplify right side
    1,288.21x = 1,427,276.64
  5. Step 5: Solve for x
    x = 1,427,276.64/1,288.21
  6. Step 6: Final answer
    x = 1,107.95

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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.