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Finding the Fourth Proportional to 215.88, 321.38 and 205.35

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Solution

The fourth proportional to 215.88, 321.38 and 205.35 is: 305.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.88 : 321.38 = 205.35 : x
  2. Step 2: Convert to fraction form
    215.88/321.38 = 205.35/x
  3. Step 3: Cross multiply
    215.88x = 321.38 × 205.35
  4. Step 4: Simplify right side
    215.88x = 65,994.36
  5. Step 5: Solve for x
    x = 65,994.36/215.88
  6. Step 6: Final answer
    x = 305.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.