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Finding the Fourth Proportional to 406.09, 560.40 and 231.45

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Solution

The fourth proportional to 406.09, 560.40 and 231.45 is: 319.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.09 : 560.40 = 231.45 : x
  2. Step 2: Convert to fraction form
    406.09/560.40 = 231.45/x
  3. Step 3: Cross multiply
    406.09x = 560.40 × 231.45
  4. Step 4: Simplify right side
    406.09x = 129,704.58
  5. Step 5: Solve for x
    x = 129,704.58/406.09
  6. Step 6: Final answer
    x = 319.40

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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.