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Finding the Fourth Proportional to 1,659.91, 2,290.57 and 961.51

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Solution

The fourth proportional to 1,659.91, 2,290.57 and 961.51 is: 1,326.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,659.91 : 2,290.57 = 961.51 : x
  2. Step 2: Convert to fraction form
    1,659.91/2,290.57 = 961.51/x
  3. Step 3: Cross multiply
    1,659.91x = 2,290.57 × 961.51
  4. Step 4: Simplify right side
    1,659.91x = 2,202,405.96
  5. Step 5: Solve for x
    x = 2,202,405.96/1,659.91
  6. Step 6: Final answer
    x = 1,326.82

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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.