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Finding the Fourth Proportional to 857.37, 1,285.80 and 272.35

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Solution

The fourth proportional to 857.37, 1,285.80 and 272.35 is: 408.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.37 : 1,285.80 = 272.35 : x
  2. Step 2: Convert to fraction form
    857.37/1,285.80 = 272.35/x
  3. Step 3: Cross multiply
    857.37x = 1,285.80 × 272.35
  4. Step 4: Simplify right side
    857.37x = 350,183.39
  5. Step 5: Solve for x
    x = 350,183.39/857.37
  6. Step 6: Final answer
    x = 408.44

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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.