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Finding the Fourth Proportional to 1,091.06, 1,642.75 and 961.89

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Solution

The fourth proportional to 1,091.06, 1,642.75 and 961.89 is: 1,448.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.06 : 1,642.75 = 961.89 : x
  2. Step 2: Convert to fraction form
    1,091.06/1,642.75 = 961.89/x
  3. Step 3: Cross multiply
    1,091.06x = 1,642.75 × 961.89
  4. Step 4: Simplify right side
    1,091.06x = 1,580,136.58
  5. Step 5: Solve for x
    x = 1,580,136.58/1,091.06
  6. Step 6: Final answer
    x = 1,448.26

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.