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Finding the Fourth Proportional to 1,186.23, 1,777.41 and 991.83

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Solution

The fourth proportional to 1,186.23, 1,777.41 and 991.83 is: 1,486.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.23 : 1,777.41 = 991.83 : x
  2. Step 2: Convert to fraction form
    1,186.23/1,777.41 = 991.83/x
  3. Step 3: Cross multiply
    1,186.23x = 1,777.41 × 991.83
  4. Step 4: Simplify right side
    1,186.23x = 1,762,888.56
  5. Step 5: Solve for x
    x = 1,762,888.56/1,186.23
  6. Step 6: Final answer
    x = 1,486.13

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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.