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Finding the Fourth Proportional to 316.90, 475.32 and 121.90

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Solution

The fourth proportional to 316.90, 475.32 and 121.90 is: 182.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.90 : 475.32 = 121.90 : x
  2. Step 2: Convert to fraction form
    316.90/475.32 = 121.90/x
  3. Step 3: Cross multiply
    316.90x = 475.32 × 121.90
  4. Step 4: Simplify right side
    316.90x = 57,941.51
  5. Step 5: Solve for x
    x = 57,941.51/316.90
  6. Step 6: Final answer
    x = 182.84

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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.