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Finding the Fourth Proportional to 716.42, 1,075.31 and 443.05

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Solution

The fourth proportional to 716.42, 1,075.31 and 443.05 is: 664.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.42 : 1,075.31 = 443.05 : x
  2. Step 2: Convert to fraction form
    716.42/1,075.31 = 443.05/x
  3. Step 3: Cross multiply
    716.42x = 1,075.31 × 443.05
  4. Step 4: Simplify right side
    716.42x = 476,412.85
  5. Step 5: Solve for x
    x = 476,412.85/716.42
  6. Step 6: Final answer
    x = 664.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.