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Finding the Fourth Proportional to 316.83, 475.39 and 111.55

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Solution

The fourth proportional to 316.83, 475.39 and 111.55 is: 167.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.83 : 475.39 = 111.55 : x
  2. Step 2: Convert to fraction form
    316.83/475.39 = 111.55/x
  3. Step 3: Cross multiply
    316.83x = 475.39 × 111.55
  4. Step 4: Simplify right side
    316.83x = 53,026.82
  5. Step 5: Solve for x
    x = 53,026.82/316.83
  6. Step 6: Final answer
    x = 167.37

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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.