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Finding the Fourth Proportional to 144.78, 217.10 and 53.50

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Solution

The fourth proportional to 144.78, 217.10 and 53.50 is: 80.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.78 : 217.10 = 53.50 : x
  2. Step 2: Convert to fraction form
    144.78/217.10 = 53.50/x
  3. Step 3: Cross multiply
    144.78x = 217.10 × 53.50
  4. Step 4: Simplify right side
    144.78x = 11,614.85
  5. Step 5: Solve for x
    x = 11,614.85/144.78
  6. Step 6: Final answer
    x = 80.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.