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Finding the Fourth Proportional to 421.40, 581.48 and 234.89

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Solution

The fourth proportional to 421.40, 581.48 and 234.89 is: 324.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.40 : 581.48 = 234.89 : x
  2. Step 2: Convert to fraction form
    421.40/581.48 = 234.89/x
  3. Step 3: Cross multiply
    421.40x = 581.48 × 234.89
  4. Step 4: Simplify right side
    421.40x = 136,583.84
  5. Step 5: Solve for x
    x = 136,583.84/421.40
  6. Step 6: Final answer
    x = 324.12

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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.