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Finding the Fourth Proportional to 1,185.96, 1,777.32 and 861.24

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Solution

The fourth proportional to 1,185.96, 1,777.32 and 861.24 is: 1,290.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.96 : 1,777.32 = 861.24 : x
  2. Step 2: Convert to fraction form
    1,185.96/1,777.32 = 861.24/x
  3. Step 3: Cross multiply
    1,185.96x = 1,777.32 × 861.24
  4. Step 4: Simplify right side
    1,185.96x = 1,530,699.08
  5. Step 5: Solve for x
    x = 1,530,699.08/1,185.96
  6. Step 6: Final answer
    x = 1,290.68

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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.