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Finding the Fourth Proportional to 317.88, 438.48 and 217.08

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Solution

The fourth proportional to 317.88, 438.48 and 217.08 is: 299.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.88 : 438.48 = 217.08 : x
  2. Step 2: Convert to fraction form
    317.88/438.48 = 217.08/x
  3. Step 3: Cross multiply
    317.88x = 438.48 × 217.08
  4. Step 4: Simplify right side
    317.88x = 95,185.24
  5. Step 5: Solve for x
    x = 95,185.24/317.88
  6. Step 6: Final answer
    x = 299.44

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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.