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Finding the Fourth Proportional to 421.39, 581.50 and 234.87

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Solution

The fourth proportional to 421.39, 581.50 and 234.87 is: 324.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.39 : 581.50 = 234.87 : x
  2. Step 2: Convert to fraction form
    421.39/581.50 = 234.87/x
  3. Step 3: Cross multiply
    421.39x = 581.50 × 234.87
  4. Step 4: Simplify right side
    421.39x = 136,576.91
  5. Step 5: Solve for x
    x = 136,576.91/421.39
  6. Step 6: Final answer
    x = 324.11

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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.