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Finding the Fourth Proportional to 314.79, 434.49 and 221.56

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Solution

The fourth proportional to 314.79, 434.49 and 221.56 is: 305.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.79 : 434.49 = 221.56 : x
  2. Step 2: Convert to fraction form
    314.79/434.49 = 221.56/x
  3. Step 3: Cross multiply
    314.79x = 434.49 × 221.56
  4. Step 4: Simplify right side
    314.79x = 96,265.53
  5. Step 5: Solve for x
    x = 96,265.53/314.79
  6. Step 6: Final answer
    x = 305.81

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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.