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Finding the Fourth Proportional to 1,280.91, 1,921.97 and 761.94

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Solution

The fourth proportional to 1,280.91, 1,921.97 and 761.94 is: 1,143.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.91 : 1,921.97 = 761.94 : x
  2. Step 2: Convert to fraction form
    1,280.91/1,921.97 = 761.94/x
  3. Step 3: Cross multiply
    1,280.91x = 1,921.97 × 761.94
  4. Step 4: Simplify right side
    1,280.91x = 1,464,422.01
  5. Step 5: Solve for x
    x = 1,464,422.01/1,280.91
  6. Step 6: Final answer
    x = 1,143.27

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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.