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Finding the Fourth Proportional to 919.27, 1,378.95 and 371.53

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Solution

The fourth proportional to 919.27, 1,378.95 and 371.53 is: 557.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.27 : 1,378.95 = 371.53 : x
  2. Step 2: Convert to fraction form
    919.27/1,378.95 = 371.53/x
  3. Step 3: Cross multiply
    919.27x = 1,378.95 × 371.53
  4. Step 4: Simplify right side
    919.27x = 512,321.29
  5. Step 5: Solve for x
    x = 512,321.29/919.27
  6. Step 6: Final answer
    x = 557.31

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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.