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Finding the Fourth Proportional to 215.63, 323.43 and 85.66

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Solution

The fourth proportional to 215.63, 323.43 and 85.66 is: 128.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.63 : 323.43 = 85.66 : x
  2. Step 2: Convert to fraction form
    215.63/323.43 = 85.66/x
  3. Step 3: Cross multiply
    215.63x = 323.43 × 85.66
  4. Step 4: Simplify right side
    215.63x = 27,703.88
  5. Step 5: Solve for x
    x = 27,703.88/215.63
  6. Step 6: Final answer
    x = 128.48

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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.