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Finding the Fourth Proportional to 421.21, 581.27 and 234.72

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Solution

The fourth proportional to 421.21, 581.27 and 234.72 is: 323.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.21 : 581.27 = 234.72 : x
  2. Step 2: Convert to fraction form
    421.21/581.27 = 234.72/x
  3. Step 3: Cross multiply
    421.21x = 581.27 × 234.72
  4. Step 4: Simplify right side
    421.21x = 136,434.52
  5. Step 5: Solve for x
    x = 136,434.52/421.21
  6. Step 6: Final answer
    x = 323.91

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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.