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Finding the Fourth Proportional to 316.38, 474.30 and 121.27

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Solution

The fourth proportional to 316.38, 474.30 and 121.27 is: 181.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.38 : 474.30 = 121.27 : x
  2. Step 2: Convert to fraction form
    316.38/474.30 = 121.27/x
  3. Step 3: Cross multiply
    316.38x = 474.30 × 121.27
  4. Step 4: Simplify right side
    316.38x = 57,518.36
  5. Step 5: Solve for x
    x = 57,518.36/316.38
  6. Step 6: Final answer
    x = 181.80

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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.