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Finding the Fourth Proportional to 421.74, 632.41 and 239.09

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Solution

The fourth proportional to 421.74, 632.41 and 239.09 is: 358.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.74 : 632.41 = 239.09 : x
  2. Step 2: Convert to fraction form
    421.74/632.41 = 239.09/x
  3. Step 3: Cross multiply
    421.74x = 632.41 × 239.09
  4. Step 4: Simplify right side
    421.74x = 151,200.24
  5. Step 5: Solve for x
    x = 151,200.24/421.74
  6. Step 6: Final answer
    x = 358.51

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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.