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Finding the Fourth Proportional to 779.20, 1,075.66 and 484.65

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Solution

The fourth proportional to 779.20, 1,075.66 and 484.65 is: 669.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.20 : 1,075.66 = 484.65 : x
  2. Step 2: Convert to fraction form
    779.20/1,075.66 = 484.65/x
  3. Step 3: Cross multiply
    779.20x = 1,075.66 × 484.65
  4. Step 4: Simplify right side
    779.20x = 521,317.41
  5. Step 5: Solve for x
    x = 521,317.41/779.20
  6. Step 6: Final answer
    x = 669.04

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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.