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Finding the Fourth Proportional to 1,186.45, 1,779.71 and 699.23

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Solution

The fourth proportional to 1,186.45, 1,779.71 and 699.23 is: 1,048.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.45 : 1,779.71 = 699.23 : x
  2. Step 2: Convert to fraction form
    1,186.45/1,779.71 = 699.23/x
  3. Step 3: Cross multiply
    1,186.45x = 1,779.71 × 699.23
  4. Step 4: Simplify right side
    1,186.45x = 1,244,427.58
  5. Step 5: Solve for x
    x = 1,244,427.58/1,186.45
  6. Step 6: Final answer
    x = 1,048.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.