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Finding the Fourth Proportional to 319.31, 478.79 and 136.61

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Solution

The fourth proportional to 319.31, 478.79 and 136.61 is: 204.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.31 : 478.79 = 136.61 : x
  2. Step 2: Convert to fraction form
    319.31/478.79 = 136.61/x
  3. Step 3: Cross multiply
    319.31x = 478.79 × 136.61
  4. Step 4: Simplify right side
    319.31x = 65,407.50
  5. Step 5: Solve for x
    x = 65,407.50/319.31
  6. Step 6: Final answer
    x = 204.84

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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.