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Finding the Fourth Proportional to 838.87, 1,156.34 and 661.41

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Solution

The fourth proportional to 838.87, 1,156.34 and 661.41 is: 911.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.87 : 1,156.34 = 661.41 : x
  2. Step 2: Convert to fraction form
    838.87/1,156.34 = 661.41/x
  3. Step 3: Cross multiply
    838.87x = 1,156.34 × 661.41
  4. Step 4: Simplify right side
    838.87x = 764,816.49
  5. Step 5: Solve for x
    x = 764,816.49/838.87
  6. Step 6: Final answer
    x = 911.73

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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.