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Finding the Fourth Proportional to 219.70, 303.21 and 131.21

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Solution

The fourth proportional to 219.70, 303.21 and 131.21 is: 181.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.70 : 303.21 = 131.21 : x
  2. Step 2: Convert to fraction form
    219.70/303.21 = 131.21/x
  3. Step 3: Cross multiply
    219.70x = 303.21 × 131.21
  4. Step 4: Simplify right side
    219.70x = 39,784.18
  5. Step 5: Solve for x
    x = 39,784.18/219.70
  6. Step 6: Final answer
    x = 181.08

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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.