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Finding the Fourth Proportional to 716.82, 1,075.70 and 392.42

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Solution

The fourth proportional to 716.82, 1,075.70 and 392.42 is: 588.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.82 : 1,075.70 = 392.42 : x
  2. Step 2: Convert to fraction form
    716.82/1,075.70 = 392.42/x
  3. Step 3: Cross multiply
    716.82x = 1,075.70 × 392.42
  4. Step 4: Simplify right side
    716.82x = 422,121.80
  5. Step 5: Solve for x
    x = 422,121.80/716.82
  6. Step 6: Final answer
    x = 588.88

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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.