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Finding the Fourth Proportional to 421.05, 581.06 and 234.55

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Solution

The fourth proportional to 421.05, 581.06 and 234.55 is: 323.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.05 : 581.06 = 234.55 : x
  2. Step 2: Convert to fraction form
    421.05/581.06 = 234.55/x
  3. Step 3: Cross multiply
    421.05x = 581.06 × 234.55
  4. Step 4: Simplify right side
    421.05x = 136,287.62
  5. Step 5: Solve for x
    x = 136,287.62/421.05
  6. Step 6: Final answer
    x = 323.69

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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.