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Finding the Fourth Proportional to 432.28, 648.38 and 239.88

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Solution

The fourth proportional to 432.28, 648.38 and 239.88 is: 359.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.28 : 648.38 = 239.88 : x
  2. Step 2: Convert to fraction form
    432.28/648.38 = 239.88/x
  3. Step 3: Cross multiply
    432.28x = 648.38 × 239.88
  4. Step 4: Simplify right side
    432.28x = 155,533.39
  5. Step 5: Solve for x
    x = 155,533.39/432.28
  6. Step 6: Final answer
    x = 359.80

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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.