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Finding the Fourth Proportional to 1,296.32, 1,789.20 and 961.28

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Solution

The fourth proportional to 1,296.32, 1,789.20 and 961.28 is: 1,326.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.32 : 1,789.20 = 961.28 : x
  2. Step 2: Convert to fraction form
    1,296.32/1,789.20 = 961.28/x
  3. Step 3: Cross multiply
    1,296.32x = 1,789.20 × 961.28
  4. Step 4: Simplify right side
    1,296.32x = 1,719,922.18
  5. Step 5: Solve for x
    x = 1,719,922.18/1,296.32
  6. Step 6: Final answer
    x = 1,326.77

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1.5x scale

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.