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Finding the Fourth Proportional to 431.94, 648.18 and 239.52

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Solution

The fourth proportional to 431.94, 648.18 and 239.52 is: 359.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.94 : 648.18 = 239.52 : x
  2. Step 2: Convert to fraction form
    431.94/648.18 = 239.52/x
  3. Step 3: Cross multiply
    431.94x = 648.18 × 239.52
  4. Step 4: Simplify right side
    431.94x = 155,252.07
  5. Step 5: Solve for x
    x = 155,252.07/431.94
  6. Step 6: Final answer
    x = 359.43

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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.