Home / 1,221.08-1,687.10-961.07

Finding the Fourth Proportional to 1,221.08, 1,687.10 and 961.07

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Solution

The fourth proportional to 1,221.08, 1,687.10 and 961.07 is: 1,327.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.08 : 1,687.10 = 961.07 : x
  2. Step 2: Convert to fraction form
    1,221.08/1,687.10 = 961.07/x
  3. Step 3: Cross multiply
    1,221.08x = 1,687.10 × 961.07
  4. Step 4: Simplify right side
    1,221.08x = 1,621,407.96
  5. Step 5: Solve for x
    x = 1,621,407.96/1,221.08
  6. Step 6: Final answer
    x = 1,327.85

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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.