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Finding the Fourth Proportional to 779.44, 1,075.56 and 484.80

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Solution

The fourth proportional to 779.44, 1,075.56 and 484.80 is: 668.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.44 : 1,075.56 = 484.80 : x
  2. Step 2: Convert to fraction form
    779.44/1,075.56 = 484.80/x
  3. Step 3: Cross multiply
    779.44x = 1,075.56 × 484.80
  4. Step 4: Simplify right side
    779.44x = 521,431.49
  5. Step 5: Solve for x
    x = 521,431.49/779.44
  6. Step 6: Final answer
    x = 668.98

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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.