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Finding the Fourth Proportional to 317.48, 475.90 and 111.88

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Solution

The fourth proportional to 317.48, 475.90 and 111.88 is: 167.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.48 : 475.90 = 111.88 : x
  2. Step 2: Convert to fraction form
    317.48/475.90 = 111.88/x
  3. Step 3: Cross multiply
    317.48x = 475.90 × 111.88
  4. Step 4: Simplify right side
    317.48x = 53,240.75
  5. Step 5: Solve for x
    x = 53,240.75/317.48
  6. Step 6: Final answer
    x = 167.70

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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.