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Finding the Fourth Proportional to 406.90, 561.52 and 220.39

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Solution

The fourth proportional to 406.90, 561.52 and 220.39 is: 304.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.90 : 561.52 = 220.39 : x
  2. Step 2: Convert to fraction form
    406.90/561.52 = 220.39/x
  3. Step 3: Cross multiply
    406.90x = 561.52 × 220.39
  4. Step 4: Simplify right side
    406.90x = 123,754.22
  5. Step 5: Solve for x
    x = 123,754.22/406.90
  6. Step 6: Final answer
    x = 304.14

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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.