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Finding the Fourth Proportional to 407.98, 562.99 and 221.46

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Solution

The fourth proportional to 407.98, 562.99 and 221.46 is: 305.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.98 : 562.99 = 221.46 : x
  2. Step 2: Convert to fraction form
    407.98/562.99 = 221.46/x
  3. Step 3: Cross multiply
    407.98x = 562.99 × 221.46
  4. Step 4: Simplify right side
    407.98x = 124,682.33
  5. Step 5: Solve for x
    x = 124,682.33/407.98
  6. Step 6: Final answer
    x = 305.61

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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.