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Finding the Fourth Proportional to 317.12, 475.76 and 311.68

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Solution

The fourth proportional to 317.12, 475.76 and 311.68 is: 467.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.12 : 475.76 = 311.68 : x
  2. Step 2: Convert to fraction form
    317.12/475.76 = 311.68/x
  3. Step 3: Cross multiply
    317.12x = 475.76 × 311.68
  4. Step 4: Simplify right side
    317.12x = 148,284.88
  5. Step 5: Solve for x
    x = 148,284.88/317.12
  6. Step 6: Final answer
    x = 467.60

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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.