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Finding the Fourth Proportional to 871.54, 1,201.90 and 682.50

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Solution

The fourth proportional to 871.54, 1,201.90 and 682.50 is: 941.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.54 : 1,201.90 = 682.50 : x
  2. Step 2: Convert to fraction form
    871.54/1,201.90 = 682.50/x
  3. Step 3: Cross multiply
    871.54x = 1,201.90 × 682.50
  4. Step 4: Simplify right side
    871.54x = 820,296.75
  5. Step 5: Solve for x
    x = 820,296.75/871.54
  6. Step 6: Final answer
    x = 941.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.