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Finding the Fourth Proportional to 314.69, 434.06 and 221.43

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Solution

The fourth proportional to 314.69, 434.06 and 221.43 is: 305.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.69 : 434.06 = 221.43 : x
  2. Step 2: Convert to fraction form
    314.69/434.06 = 221.43/x
  3. Step 3: Cross multiply
    314.69x = 434.06 × 221.43
  4. Step 4: Simplify right side
    314.69x = 96,115.26
  5. Step 5: Solve for x
    x = 96,115.26/314.69
  6. Step 6: Final answer
    x = 305.43

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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.