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Finding the Fourth Proportional to 321.78, 482.79 and 159.36

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Solution

The fourth proportional to 321.78, 482.79 and 159.36 is: 239.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.78 : 482.79 = 159.36 : x
  2. Step 2: Convert to fraction form
    321.78/482.79 = 159.36/x
  3. Step 3: Cross multiply
    321.78x = 482.79 × 159.36
  4. Step 4: Simplify right side
    321.78x = 76,937.41
  5. Step 5: Solve for x
    x = 76,937.41/321.78
  6. Step 6: Final answer
    x = 239.10

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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.