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Finding the Fourth Proportional to 144.78, 218.72 and 143.43

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Solution

The fourth proportional to 144.78, 218.72 and 143.43 is: 216.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.78 : 218.72 = 143.43 : x
  2. Step 2: Convert to fraction form
    144.78/218.72 = 143.43/x
  3. Step 3: Cross multiply
    144.78x = 218.72 × 143.43
  4. Step 4: Simplify right side
    144.78x = 31,370.29
  5. Step 5: Solve for x
    x = 31,370.29/144.78
  6. Step 6: Final answer
    x = 216.68

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.