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Finding the Fourth Proportional to 778.41, 1,078.70 and 632.61

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Solution

The fourth proportional to 778.41, 1,078.70 and 632.61 is: 876.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.41 : 1,078.70 = 632.61 : x
  2. Step 2: Convert to fraction form
    778.41/1,078.70 = 632.61/x
  3. Step 3: Cross multiply
    778.41x = 1,078.70 × 632.61
  4. Step 4: Simplify right side
    778.41x = 682,393.24
  5. Step 5: Solve for x
    x = 682,393.24/778.41
  6. Step 6: Final answer
    x = 876.65

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Double scale
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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.