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Finding the Fourth Proportional to 316.28, 474.39 and 85.19

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Solution

The fourth proportional to 316.28, 474.39 and 85.19 is: 127.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.28 : 474.39 = 85.19 : x
  2. Step 2: Convert to fraction form
    316.28/474.39 = 85.19/x
  3. Step 3: Cross multiply
    316.28x = 474.39 × 85.19
  4. Step 4: Simplify right side
    316.28x = 40,413.28
  5. Step 5: Solve for x
    x = 40,413.28/316.28
  6. Step 6: Final answer
    x = 127.78

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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.