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Finding the Fourth Proportional to 685.80, 1,028.43 and 275.00

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Solution

The fourth proportional to 685.80, 1,028.43 and 275.00 is: 412.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.80 : 1,028.43 = 275.00 : x
  2. Step 2: Convert to fraction form
    685.80/1,028.43 = 275.00/x
  3. Step 3: Cross multiply
    685.80x = 1,028.43 × 275.00
  4. Step 4: Simplify right side
    685.80x = 282,813.11
  5. Step 5: Solve for x
    x = 282,813.11/685.80
  6. Step 6: Final answer
    x = 412.38

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