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Finding the Fourth Proportional to 919.29, 1,379.75 and 371.87

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Solution

The fourth proportional to 919.29, 1,379.75 and 371.87 is: 558.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.29 : 1,379.75 = 371.87 : x
  2. Step 2: Convert to fraction form
    919.29/1,379.75 = 371.87/x
  3. Step 3: Cross multiply
    919.29x = 1,379.75 × 371.87
  4. Step 4: Simplify right side
    919.29x = 513,078.87
  5. Step 5: Solve for x
    x = 513,078.87/919.29
  6. Step 6: Final answer
    x = 558.13

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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.