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Finding the Fourth Proportional to 1,354.94, 1,867.16 and 961.28

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Solution

The fourth proportional to 1,354.94, 1,867.16 and 961.28 is: 1,324.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,354.94 : 1,867.16 = 961.28 : x
  2. Step 2: Convert to fraction form
    1,354.94/1,867.16 = 961.28/x
  3. Step 3: Cross multiply
    1,354.94x = 1,867.16 × 961.28
  4. Step 4: Simplify right side
    1,354.94x = 1,794,863.56
  5. Step 5: Solve for x
    x = 1,794,863.56/1,354.94
  6. Step 6: Final answer
    x = 1,324.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.