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Finding the Fourth Proportional to 406.78, 561.14 and 308.36

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Solution

The fourth proportional to 406.78, 561.14 and 308.36 is: 425.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.78 : 561.14 = 308.36 : x
  2. Step 2: Convert to fraction form
    406.78/561.14 = 308.36/x
  3. Step 3: Cross multiply
    406.78x = 561.14 × 308.36
  4. Step 4: Simplify right side
    406.78x = 173,033.13
  5. Step 5: Solve for x
    x = 173,033.13/406.78
  6. Step 6: Final answer
    x = 425.37

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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.