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Finding the Fourth Proportional to 779.58, 1,075.78 and 484.85

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Solution

The fourth proportional to 779.58, 1,075.78 and 484.85 is: 669.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.58 : 1,075.78 = 484.85 : x
  2. Step 2: Convert to fraction form
    779.58/1,075.78 = 484.85/x
  3. Step 3: Cross multiply
    779.58x = 1,075.78 × 484.85
  4. Step 4: Simplify right side
    779.58x = 521,585.34
  5. Step 5: Solve for x
    x = 521,585.34/779.58
  6. Step 6: Final answer
    x = 669.06

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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.