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Finding the Fourth Proportional to 685.37, 1,025.96 and 554.15

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Solution

The fourth proportional to 685.37, 1,025.96 and 554.15 is: 829.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.37 : 1,025.96 = 554.15 : x
  2. Step 2: Convert to fraction form
    685.37/1,025.96 = 554.15/x
  3. Step 3: Cross multiply
    685.37x = 1,025.96 × 554.15
  4. Step 4: Simplify right side
    685.37x = 568,535.73
  5. Step 5: Solve for x
    x = 568,535.73/685.37
  6. Step 6: Final answer
    x = 829.53

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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.