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Finding the Fourth Proportional to 1,280.14, 1,920.21 and 731.94

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Solution

The fourth proportional to 1,280.14, 1,920.21 and 731.94 is: 1,097.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.14 : 1,920.21 = 731.94 : x
  2. Step 2: Convert to fraction form
    1,280.14/1,920.21 = 731.94/x
  3. Step 3: Cross multiply
    1,280.14x = 1,920.21 × 731.94
  4. Step 4: Simplify right side
    1,280.14x = 1,405,468.56
  5. Step 5: Solve for x
    x = 1,405,468.56/1,280.14
  6. Step 6: Final answer
    x = 1,097.90

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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.