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Finding the Fourth Proportional to 782.73, 1,077.71 and 635.85

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Solution

The fourth proportional to 782.73, 1,077.71 and 635.85 is: 875.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.73 : 1,077.71 = 635.85 : x
  2. Step 2: Convert to fraction form
    782.73/1,077.71 = 635.85/x
  3. Step 3: Cross multiply
    782.73x = 1,077.71 × 635.85
  4. Step 4: Simplify right side
    782.73x = 685,258.72
  5. Step 5: Solve for x
    x = 685,258.72/782.73
  6. Step 6: Final answer
    x = 875.47

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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.