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Finding the Fourth Proportional to 314.96, 434.36 and 221.81

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Solution

The fourth proportional to 314.96, 434.36 and 221.81 is: 305.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.96 : 434.36 = 221.81 : x
  2. Step 2: Convert to fraction form
    314.96/434.36 = 221.81/x
  3. Step 3: Cross multiply
    314.96x = 434.36 × 221.81
  4. Step 4: Simplify right side
    314.96x = 96,343.77
  5. Step 5: Solve for x
    x = 96,343.77/314.96
  6. Step 6: Final answer
    x = 305.90

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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.