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Finding the Fourth Proportional to 319.28, 478.88 and 126.76

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Solution

The fourth proportional to 319.28, 478.88 and 126.76 is: 190.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.28 : 478.88 = 126.76 : x
  2. Step 2: Convert to fraction form
    319.28/478.88 = 126.76/x
  3. Step 3: Cross multiply
    319.28x = 478.88 × 126.76
  4. Step 4: Simplify right side
    319.28x = 60,702.83
  5. Step 5: Solve for x
    x = 60,702.83/319.28
  6. Step 6: Final answer
    x = 190.12

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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.