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Finding the Fourth Proportional to 712.99, 1,069.83 and 323.28

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Solution

The fourth proportional to 712.99, 1,069.83 and 323.28 is: 485.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.99 : 1,069.83 = 323.28 : x
  2. Step 2: Convert to fraction form
    712.99/1,069.83 = 323.28/x
  3. Step 3: Cross multiply
    712.99x = 1,069.83 × 323.28
  4. Step 4: Simplify right side
    712.99x = 345,854.64
  5. Step 5: Solve for x
    x = 345,854.64/712.99
  6. Step 6: Final answer
    x = 485.08

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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.