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Finding the Fourth Proportional to 783.88, 1,082.26 and 636.86

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Solution

The fourth proportional to 783.88, 1,082.26 and 636.86 is: 879.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.88 : 1,082.26 = 636.86 : x
  2. Step 2: Convert to fraction form
    783.88/1,082.26 = 636.86/x
  3. Step 3: Cross multiply
    783.88x = 1,082.26 × 636.86
  4. Step 4: Simplify right side
    783.88x = 689,251.61
  5. Step 5: Solve for x
    x = 689,251.61/783.88
  6. Step 6: Final answer
    x = 879.28

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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.