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Finding the Fourth Proportional to 317.15, 475.72 and 111.86

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Solution

The fourth proportional to 317.15, 475.72 and 111.86 is: 167.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.15 : 475.72 = 111.86 : x
  2. Step 2: Convert to fraction form
    317.15/475.72 = 111.86/x
  3. Step 3: Cross multiply
    317.15x = 475.72 × 111.86
  4. Step 4: Simplify right side
    317.15x = 53,214.04
  5. Step 5: Solve for x
    x = 53,214.04/317.15
  6. Step 6: Final answer
    x = 167.79

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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.