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Finding the Fourth Proportional to 406.28, 558.87 and 339.86

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Solution

The fourth proportional to 406.28, 558.87 and 339.86 is: 467.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.28 : 558.87 = 339.86 : x
  2. Step 2: Convert to fraction form
    406.28/558.87 = 339.86/x
  3. Step 3: Cross multiply
    406.28x = 558.87 × 339.86
  4. Step 4: Simplify right side
    406.28x = 189,934.76
  5. Step 5: Solve for x
    x = 189,934.76/406.28
  6. Step 6: Final answer
    x = 467.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.