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Finding the Fourth Proportional to 685.53, 1,028.30 and 172.53

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Solution

The fourth proportional to 685.53, 1,028.30 and 172.53 is: 258.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.53 : 1,028.30 = 172.53 : x
  2. Step 2: Convert to fraction form
    685.53/1,028.30 = 172.53/x
  3. Step 3: Cross multiply
    685.53x = 1,028.30 × 172.53
  4. Step 4: Simplify right side
    685.53x = 177,412.60
  5. Step 5: Solve for x
    x = 177,412.60/685.53
  6. Step 6: Final answer
    x = 258.80

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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.