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Finding the Fourth Proportional to 421.61, 632.69 and 239.36

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Solution

The fourth proportional to 421.61, 632.69 and 239.36 is: 359.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.61 : 632.69 = 239.36 : x
  2. Step 2: Convert to fraction form
    421.61/632.69 = 239.36/x
  3. Step 3: Cross multiply
    421.61x = 632.69 × 239.36
  4. Step 4: Simplify right side
    421.61x = 151,440.68
  5. Step 5: Solve for x
    x = 151,440.68/421.61
  6. Step 6: Final answer
    x = 359.20

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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.