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Finding the Fourth Proportional to 317.45, 438.39 and 206.99

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Solution

The fourth proportional to 317.45, 438.39 and 206.99 is: 285.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.45 : 438.39 = 206.99 : x
  2. Step 2: Convert to fraction form
    317.45/438.39 = 206.99/x
  3. Step 3: Cross multiply
    317.45x = 438.39 × 206.99
  4. Step 4: Simplify right side
    317.45x = 90,742.57
  5. Step 5: Solve for x
    x = 90,742.57/317.45
  6. Step 6: Final answer
    x = 285.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.