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Finding the Fourth Proportional to 778.80, 1,075.11 and 464.25

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Solution

The fourth proportional to 778.80, 1,075.11 and 464.25 is: 640.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.80 : 1,075.11 = 464.25 : x
  2. Step 2: Convert to fraction form
    778.80/1,075.11 = 464.25/x
  3. Step 3: Cross multiply
    778.80x = 1,075.11 × 464.25
  4. Step 4: Simplify right side
    778.80x = 499,119.82
  5. Step 5: Solve for x
    x = 499,119.82/778.80
  6. Step 6: Final answer
    x = 640.88

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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.