Home / 1,311.90-1,811.46-1,016.65

Finding the Fourth Proportional to 1,311.90, 1,811.46 and 1,016.65

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Solution

The fourth proportional to 1,311.90, 1,811.46 and 1,016.65 is: 1,403.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.90 : 1,811.46 = 1,016.65 : x
  2. Step 2: Convert to fraction form
    1,311.90/1,811.46 = 1,016.65/x
  3. Step 3: Cross multiply
    1,311.90x = 1,811.46 × 1,016.65
  4. Step 4: Simplify right side
    1,311.90x = 1,841,620.81
  5. Step 5: Solve for x
    x = 1,841,620.81/1,311.90
  6. Step 6: Final answer
    x = 1,403.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.