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Finding the Fourth Proportional to 401.21, 600.53 and 215.65

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Solution

The fourth proportional to 401.21, 600.53 and 215.65 is: 322.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.21 : 600.53 = 215.65 : x
  2. Step 2: Convert to fraction form
    401.21/600.53 = 215.65/x
  3. Step 3: Cross multiply
    401.21x = 600.53 × 215.65
  4. Step 4: Simplify right side
    401.21x = 129,504.29
  5. Step 5: Solve for x
    x = 129,504.29/401.21
  6. Step 6: Final answer
    x = 322.78

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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.