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Finding the Fourth Proportional to 266.56, 398.94 and 215.08

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Solution

The fourth proportional to 266.56, 398.94 and 215.08 is: 321.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.56 : 398.94 = 215.08 : x
  2. Step 2: Convert to fraction form
    266.56/398.94 = 215.08/x
  3. Step 3: Cross multiply
    266.56x = 398.94 × 215.08
  4. Step 4: Simplify right side
    266.56x = 85,804.02
  5. Step 5: Solve for x
    x = 85,804.02/266.56
  6. Step 6: Final answer
    x = 321.89

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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.