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Finding the Fourth Proportional to 778.21, 1,078.45 and 763.63

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Solution

The fourth proportional to 778.21, 1,078.45 and 763.63 is: 1,058.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.21 : 1,078.45 = 763.63 : x
  2. Step 2: Convert to fraction form
    778.21/1,078.45 = 763.63/x
  3. Step 3: Cross multiply
    778.21x = 1,078.45 × 763.63
  4. Step 4: Simplify right side
    778.21x = 823,536.77
  5. Step 5: Solve for x
    x = 823,536.77/778.21
  6. Step 6: Final answer
    x = 1,058.24

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.