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Finding the Fourth Proportional to 779.12, 1,075.64 and 484.54

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Solution

The fourth proportional to 779.12, 1,075.64 and 484.54 is: 668.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.12 : 1,075.64 = 484.54 : x
  2. Step 2: Convert to fraction form
    779.12/1,075.64 = 484.54/x
  3. Step 3: Cross multiply
    779.12x = 1,075.64 × 484.54
  4. Step 4: Simplify right side
    779.12x = 521,190.61
  5. Step 5: Solve for x
    x = 521,190.61/779.12
  6. Step 6: Final answer
    x = 668.95

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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.