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Finding the Fourth Proportional to 317.45, 438.14 and 207.09

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Solution

The fourth proportional to 317.45, 438.14 and 207.09 is: 285.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.45 : 438.14 = 207.09 : x
  2. Step 2: Convert to fraction form
    317.45/438.14 = 207.09/x
  3. Step 3: Cross multiply
    317.45x = 438.14 × 207.09
  4. Step 4: Simplify right side
    317.45x = 90,734.93
  5. Step 5: Solve for x
    x = 90,734.93/317.45
  6. Step 6: Final answer
    x = 285.82

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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.