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Finding the Fourth Proportional to 319.21, 478.53 and 270.77

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Solution

The fourth proportional to 319.21, 478.53 and 270.77 is: 405.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.21 : 478.53 = 270.77 : x
  2. Step 2: Convert to fraction form
    319.21/478.53 = 270.77/x
  3. Step 3: Cross multiply
    319.21x = 478.53 × 270.77
  4. Step 4: Simplify right side
    319.21x = 129,571.57
  5. Step 5: Solve for x
    x = 129,571.57/319.21
  6. Step 6: Final answer
    x = 405.92

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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.