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Finding the Fourth Proportional to 215.53, 321.76 and 207.93

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Solution

The fourth proportional to 215.53, 321.76 and 207.93 is: 310.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.53 : 321.76 = 207.93 : x
  2. Step 2: Convert to fraction form
    215.53/321.76 = 207.93/x
  3. Step 3: Cross multiply
    215.53x = 321.76 × 207.93
  4. Step 4: Simplify right side
    215.53x = 66,903.85
  5. Step 5: Solve for x
    x = 66,903.85/215.53
  6. Step 6: Final answer
    x = 310.42

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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.