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Finding the Fourth Proportional to 778.41, 1,073.18 and 645.14

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Solution

The fourth proportional to 778.41, 1,073.18 and 645.14 is: 889.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.41 : 1,073.18 = 645.14 : x
  2. Step 2: Convert to fraction form
    778.41/1,073.18 = 645.14/x
  3. Step 3: Cross multiply
    778.41x = 1,073.18 × 645.14
  4. Step 4: Simplify right side
    778.41x = 692,351.35
  5. Step 5: Solve for x
    x = 692,351.35/778.41
  6. Step 6: Final answer
    x = 889.44

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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.