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Finding the Fourth Proportional to 316.89, 475.40 and 121.89

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Solution

The fourth proportional to 316.89, 475.40 and 121.89 is: 182.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.89 : 475.40 = 121.89 : x
  2. Step 2: Convert to fraction form
    316.89/475.40 = 121.89/x
  3. Step 3: Cross multiply
    316.89x = 475.40 × 121.89
  4. Step 4: Simplify right side
    316.89x = 57,946.51
  5. Step 5: Solve for x
    x = 57,946.51/316.89
  6. Step 6: Final answer
    x = 182.86

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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.