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Finding the Fourth Proportional to 421.28, 632.56 and 290.96

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Solution

The fourth proportional to 421.28, 632.56 and 290.96 is: 436.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.28 : 632.56 = 290.96 : x
  2. Step 2: Convert to fraction form
    421.28/632.56 = 290.96/x
  3. Step 3: Cross multiply
    421.28x = 632.56 × 290.96
  4. Step 4: Simplify right side
    421.28x = 184,049.66
  5. Step 5: Solve for x
    x = 184,049.66/421.28
  6. Step 6: Final answer
    x = 436.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.