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Finding the Fourth Proportional to 317.09, 475.74 and 143.79

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Solution

The fourth proportional to 317.09, 475.74 and 143.79 is: 215.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.09 : 475.74 = 143.79 : x
  2. Step 2: Convert to fraction form
    317.09/475.74 = 143.79/x
  3. Step 3: Cross multiply
    317.09x = 475.74 × 143.79
  4. Step 4: Simplify right side
    317.09x = 68,406.65
  5. Step 5: Solve for x
    x = 68,406.65/317.09
  6. Step 6: Final answer
    x = 215.73

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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.