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Finding the Fourth Proportional to 783.27, 1,081.87 and 573.12

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Solution

The fourth proportional to 783.27, 1,081.87 and 573.12 is: 791.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.27 : 1,081.87 = 573.12 : x
  2. Step 2: Convert to fraction form
    783.27/1,081.87 = 573.12/x
  3. Step 3: Cross multiply
    783.27x = 1,081.87 × 573.12
  4. Step 4: Simplify right side
    783.27x = 620,039.90
  5. Step 5: Solve for x
    x = 620,039.90/783.27
  6. Step 6: Final answer
    x = 791.60

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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.