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Finding the Fourth Proportional to 321.68, 482.60 and 138.98

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Solution

The fourth proportional to 321.68, 482.60 and 138.98 is: 208.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.68 : 482.60 = 138.98 : x
  2. Step 2: Convert to fraction form
    321.68/482.60 = 138.98/x
  3. Step 3: Cross multiply
    321.68x = 482.60 × 138.98
  4. Step 4: Simplify right side
    321.68x = 67,068.64
  5. Step 5: Solve for x
    x = 67,068.64/321.68
  6. Step 6: Final answer
    x = 208.50

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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.