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Finding the Fourth Proportional to 321.88, 482.80 and 129.52

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Solution

The fourth proportional to 321.88, 482.80 and 129.52 is: 194.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.88 : 482.80 = 129.52 : x
  2. Step 2: Convert to fraction form
    321.88/482.80 = 129.52/x
  3. Step 3: Cross multiply
    321.88x = 482.80 × 129.52
  4. Step 4: Simplify right side
    321.88x = 62,532.26
  5. Step 5: Solve for x
    x = 62,532.26/321.88
  6. Step 6: Final answer
    x = 194.27

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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.