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Finding the Fourth Proportional to 439.27, 656.96 and 390.86

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Solution

The fourth proportional to 439.27, 656.96 and 390.86 is: 584.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.27 : 656.96 = 390.86 : x
  2. Step 2: Convert to fraction form
    439.27/656.96 = 390.86/x
  3. Step 3: Cross multiply
    439.27x = 656.96 × 390.86
  4. Step 4: Simplify right side
    439.27x = 256,782.01
  5. Step 5: Solve for x
    x = 256,782.01/439.27
  6. Step 6: Final answer
    x = 584.57

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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.