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Finding the Fourth Proportional to 321.68, 482.56 and 126.72

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Solution

The fourth proportional to 321.68, 482.56 and 126.72 is: 190.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.68 : 482.56 = 126.72 : x
  2. Step 2: Convert to fraction form
    321.68/482.56 = 126.72/x
  3. Step 3: Cross multiply
    321.68x = 482.56 × 126.72
  4. Step 4: Simplify right side
    321.68x = 61,150.00
  5. Step 5: Solve for x
    x = 61,150.00/321.68
  6. Step 6: Final answer
    x = 190.10

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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.