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Finding the Fourth Proportional to 779.48, 1,075.61 and 447.89

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Solution

The fourth proportional to 779.48, 1,075.61 and 447.89 is: 618.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.48 : 1,075.61 = 447.89 : x
  2. Step 2: Convert to fraction form
    779.48/1,075.61 = 447.89/x
  3. Step 3: Cross multiply
    779.48x = 1,075.61 × 447.89
  4. Step 4: Simplify right side
    779.48x = 481,750.70
  5. Step 5: Solve for x
    x = 481,750.70/779.48
  6. Step 6: Final answer
    x = 618.04

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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.