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Finding the Fourth Proportional to 778.76, 1,073.81 and 636.52

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Solution

The fourth proportional to 778.76, 1,073.81 and 636.52 is: 877.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.76 : 1,073.81 = 636.52 : x
  2. Step 2: Convert to fraction form
    778.76/1,073.81 = 636.52/x
  3. Step 3: Cross multiply
    778.76x = 1,073.81 × 636.52
  4. Step 4: Simplify right side
    778.76x = 683,504.23
  5. Step 5: Solve for x
    x = 683,504.23/778.76
  6. Step 6: Final answer
    x = 877.69

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1.5x scale

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.