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Finding the Fourth Proportional to 778.77, 1,074.72 and 480.11

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Solution

The fourth proportional to 778.77, 1,074.72 and 480.11 is: 662.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.77 : 1,074.72 = 480.11 : x
  2. Step 2: Convert to fraction form
    778.77/1,074.72 = 480.11/x
  3. Step 3: Cross multiply
    778.77x = 1,074.72 × 480.11
  4. Step 4: Simplify right side
    778.77x = 515,983.82
  5. Step 5: Solve for x
    x = 515,983.82/778.77
  6. Step 6: Final answer
    x = 662.56

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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.