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Finding the Fourth Proportional to 919.91, 1,379.88 and 372.04

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Solution

The fourth proportional to 919.91, 1,379.88 and 372.04 is: 558.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.91 : 1,379.88 = 372.04 : x
  2. Step 2: Convert to fraction form
    919.91/1,379.88 = 372.04/x
  3. Step 3: Cross multiply
    919.91x = 1,379.88 × 372.04
  4. Step 4: Simplify right side
    919.91x = 513,367.11
  5. Step 5: Solve for x
    x = 513,367.11/919.91
  6. Step 6: Final answer
    x = 558.06

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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.