Home / 1,211.12-1,661.32-1,200.74

Finding the Fourth Proportional to 1,211.12, 1,661.32 and 1,200.74

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Solution

The fourth proportional to 1,211.12, 1,661.32 and 1,200.74 is: 1,647.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.12 : 1,661.32 = 1,200.74 : x
  2. Step 2: Convert to fraction form
    1,211.12/1,661.32 = 1,200.74/x
  3. Step 3: Cross multiply
    1,211.12x = 1,661.32 × 1,200.74
  4. Step 4: Simplify right side
    1,211.12x = 1,994,813.38
  5. Step 5: Solve for x
    x = 1,994,813.38/1,211.12
  6. Step 6: Final answer
    x = 1,647.08

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.