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Finding the Fourth Proportional to 421.70, 581.90 and 235.23

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Solution

The fourth proportional to 421.70, 581.90 and 235.23 is: 324.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.70 : 581.90 = 235.23 : x
  2. Step 2: Convert to fraction form
    421.70/581.90 = 235.23/x
  3. Step 3: Cross multiply
    421.70x = 581.90 × 235.23
  4. Step 4: Simplify right side
    421.70x = 136,876.98
  5. Step 5: Solve for x
    x = 136,876.98/421.70
  6. Step 6: Final answer
    x = 324.59

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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.