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Finding the Fourth Proportional to 1,811.15, 2,716.36 and 578.22

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Solution

The fourth proportional to 1,811.15, 2,716.36 and 578.22 is: 867.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.15 : 2,716.36 = 578.22 : x
  2. Step 2: Convert to fraction form
    1,811.15/2,716.36 = 578.22/x
  3. Step 3: Cross multiply
    1,811.15x = 2,716.36 × 578.22
  4. Step 4: Simplify right side
    1,811.15x = 1,570,652.23
  5. Step 5: Solve for x
    x = 1,570,652.23/1,811.15
  6. Step 6: Final answer
    x = 867.22

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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.