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Finding the Fourth Proportional to 406.21, 560.55 and 231.61

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Solution

The fourth proportional to 406.21, 560.55 and 231.61 is: 319.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.21 : 560.55 = 231.61 : x
  2. Step 2: Convert to fraction form
    406.21/560.55 = 231.61/x
  3. Step 3: Cross multiply
    406.21x = 560.55 × 231.61
  4. Step 4: Simplify right side
    406.21x = 129,828.99
  5. Step 5: Solve for x
    x = 129,828.99/406.21
  6. Step 6: Final answer
    x = 319.61

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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.