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Finding the Fourth Proportional to 779.38, 1,075.28 and 443.25

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Solution

The fourth proportional to 779.38, 1,075.28 and 443.25 is: 611.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.38 : 1,075.28 = 443.25 : x
  2. Step 2: Convert to fraction form
    779.38/1,075.28 = 443.25/x
  3. Step 3: Cross multiply
    779.38x = 1,075.28 × 443.25
  4. Step 4: Simplify right side
    779.38x = 476,617.86
  5. Step 5: Solve for x
    x = 476,617.86/779.38
  6. Step 6: Final answer
    x = 611.53

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Double scale
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1.5x scale

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.