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Finding the Fourth Proportional to 317.25, 475.83 and 143.91

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Solution

The fourth proportional to 317.25, 475.83 and 143.91 is: 215.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.25 : 475.83 = 143.91 : x
  2. Step 2: Convert to fraction form
    317.25/475.83 = 143.91/x
  3. Step 3: Cross multiply
    317.25x = 475.83 × 143.91
  4. Step 4: Simplify right side
    317.25x = 68,476.70
  5. Step 5: Solve for x
    x = 68,476.70/317.25
  6. Step 6: Final answer
    x = 215.84

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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.