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Finding the Fourth Proportional to 1,211.06, 1,668.93 and 861.14

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Solution

The fourth proportional to 1,211.06, 1,668.93 and 861.14 is: 1,186.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.06 : 1,668.93 = 861.14 : x
  2. Step 2: Convert to fraction form
    1,211.06/1,668.93 = 861.14/x
  3. Step 3: Cross multiply
    1,211.06x = 1,668.93 × 861.14
  4. Step 4: Simplify right side
    1,211.06x = 1,437,182.38
  5. Step 5: Solve for x
    x = 1,437,182.38/1,211.06
  6. Step 6: Final answer
    x = 1,186.71

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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.