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Finding the Fourth Proportional to 217.78, 300.55 and 130.45

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Solution

The fourth proportional to 217.78, 300.55 and 130.45 is: 180.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.78 : 300.55 = 130.45 : x
  2. Step 2: Convert to fraction form
    217.78/300.55 = 130.45/x
  3. Step 3: Cross multiply
    217.78x = 300.55 × 130.45
  4. Step 4: Simplify right side
    217.78x = 39,205.24
  5. Step 5: Solve for x
    x = 39,205.24/217.78
  6. Step 6: Final answer
    x = 180.03

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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.