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Finding the Fourth Proportional to 215.81, 323.26 and 142.43

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Solution

The fourth proportional to 215.81, 323.26 and 142.43 is: 213.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.81 : 323.26 = 142.43 : x
  2. Step 2: Convert to fraction form
    215.81/323.26 = 142.43/x
  3. Step 3: Cross multiply
    215.81x = 323.26 × 142.43
  4. Step 4: Simplify right side
    215.81x = 46,041.77
  5. Step 5: Solve for x
    x = 46,041.77/215.81
  6. Step 6: Final answer
    x = 213.35

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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.