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Finding the Fourth Proportional to 219.38, 302.78 and 130.87

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Solution

The fourth proportional to 219.38, 302.78 and 130.87 is: 180.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.38 : 302.78 = 130.87 : x
  2. Step 2: Convert to fraction form
    219.38/302.78 = 130.87/x
  3. Step 3: Cross multiply
    219.38x = 302.78 × 130.87
  4. Step 4: Simplify right side
    219.38x = 39,624.39
  5. Step 5: Solve for x
    x = 39,624.39/219.38
  6. Step 6: Final answer
    x = 180.62

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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.