Home / 1,187.20-1,780.82-1,185.50

Finding the Fourth Proportional to 1,187.20, 1,780.82 and 1,185.50

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Solution

The fourth proportional to 1,187.20, 1,780.82 and 1,185.50 is: 1,778.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.20 : 1,780.82 = 1,185.50 : x
  2. Step 2: Convert to fraction form
    1,187.20/1,780.82 = 1,185.50/x
  3. Step 3: Cross multiply
    1,187.20x = 1,780.82 × 1,185.50
  4. Step 4: Simplify right side
    1,187.20x = 2,111,162.11
  5. Step 5: Solve for x
    x = 2,111,162.11/1,187.20
  6. Step 6: Final answer
    x = 1,778.27

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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.