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Finding the Fourth Proportional to 421.17, 581.21 and 234.65

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Solution

The fourth proportional to 421.17, 581.21 and 234.65 is: 323.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.17 : 581.21 = 234.65 : x
  2. Step 2: Convert to fraction form
    421.17/581.21 = 234.65/x
  3. Step 3: Cross multiply
    421.17x = 581.21 × 234.65
  4. Step 4: Simplify right side
    421.17x = 136,382.09
  5. Step 5: Solve for x
    x = 136,382.09/421.17
  6. Step 6: Final answer
    x = 323.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.