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Finding the Fourth Proportional to 406.26, 560.79 and 308.72

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Solution

The fourth proportional to 406.26, 560.79 and 308.72 is: 426.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.26 : 560.79 = 308.72 : x
  2. Step 2: Convert to fraction form
    406.26/560.79 = 308.72/x
  3. Step 3: Cross multiply
    406.26x = 560.79 × 308.72
  4. Step 4: Simplify right side
    406.26x = 173,128.49
  5. Step 5: Solve for x
    x = 173,128.49/406.26
  6. Step 6: Final answer
    x = 426.15

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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.