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Finding the Fourth Proportional to 855.58, 1,276.82 and 763.31

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Solution

The fourth proportional to 855.58, 1,276.82 and 763.31 is: 1,139.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.58 : 1,276.82 = 763.31 : x
  2. Step 2: Convert to fraction form
    855.58/1,276.82 = 763.31/x
  3. Step 3: Cross multiply
    855.58x = 1,276.82 × 763.31
  4. Step 4: Simplify right side
    855.58x = 974,608.85
  5. Step 5: Solve for x
    x = 974,608.85/855.58
  6. Step 6: Final answer
    x = 1,139.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.