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Finding the Fourth Proportional to 321.79, 482.82 and 139.32

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Solution

The fourth proportional to 321.79, 482.82 and 139.32 is: 209.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.79 : 482.82 = 139.32 : x
  2. Step 2: Convert to fraction form
    321.79/482.82 = 139.32/x
  3. Step 3: Cross multiply
    321.79x = 482.82 × 139.32
  4. Step 4: Simplify right side
    321.79x = 67,266.48
  5. Step 5: Solve for x
    x = 67,266.48/321.79
  6. Step 6: Final answer
    x = 209.04

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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.