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Finding the Fourth Proportional to 919.89, 1,380.20 and 372.56

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Solution

The fourth proportional to 919.89, 1,380.20 and 372.56 is: 558.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.89 : 1,380.20 = 372.56 : x
  2. Step 2: Convert to fraction form
    919.89/1,380.20 = 372.56/x
  3. Step 3: Cross multiply
    919.89x = 1,380.20 × 372.56
  4. Step 4: Simplify right side
    919.89x = 514,198.55
  5. Step 5: Solve for x
    x = 514,198.55/919.89
  6. Step 6: Final answer
    x = 558.98

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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.