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Finding the Fourth Proportional to 319.75, 478.70 and 238.95

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Solution

The fourth proportional to 319.75, 478.70 and 238.95 is: 357.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.75 : 478.70 = 238.95 : x
  2. Step 2: Convert to fraction form
    319.75/478.70 = 238.95/x
  3. Step 3: Cross multiply
    319.75x = 478.70 × 238.95
  4. Step 4: Simplify right side
    319.75x = 114,384.17
  5. Step 5: Solve for x
    x = 114,384.17/319.75
  6. Step 6: Final answer
    x = 357.73

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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.