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Finding the Fourth Proportional to 1,811.44, 2,715.90 and 716.86

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Solution

The fourth proportional to 1,811.44, 2,715.90 and 716.86 is: 1,074.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.44 : 2,715.90 = 716.86 : x
  2. Step 2: Convert to fraction form
    1,811.44/2,715.90 = 716.86/x
  3. Step 3: Cross multiply
    1,811.44x = 2,715.90 × 716.86
  4. Step 4: Simplify right side
    1,811.44x = 1,946,920.07
  5. Step 5: Solve for x
    x = 1,946,920.07/1,811.44
  6. Step 6: Final answer
    x = 1,074.79

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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.