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Finding the Fourth Proportional to 862.49, 1,187.31 and 779.33

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Solution

The fourth proportional to 862.49, 1,187.31 and 779.33 is: 1,072.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.49 : 1,187.31 = 779.33 : x
  2. Step 2: Convert to fraction form
    862.49/1,187.31 = 779.33/x
  3. Step 3: Cross multiply
    862.49x = 1,187.31 × 779.33
  4. Step 4: Simplify right side
    862.49x = 925,312.19
  5. Step 5: Solve for x
    x = 925,312.19/862.49
  6. Step 6: Final answer
    x = 1,072.84

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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.