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Finding the Fourth Proportional to 215.65, 323.51 and 85.58

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Solution

The fourth proportional to 215.65, 323.51 and 85.58 is: 128.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.65 : 323.51 = 85.58 : x
  2. Step 2: Convert to fraction form
    215.65/323.51 = 85.58/x
  3. Step 3: Cross multiply
    215.65x = 323.51 × 85.58
  4. Step 4: Simplify right side
    215.65x = 27,686.37
  5. Step 5: Solve for x
    x = 27,686.37/215.65
  6. Step 6: Final answer
    x = 128.39

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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.