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Finding the Fourth Proportional to 317.40, 438.22 and 212.64

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Solution

The fourth proportional to 317.40, 438.22 and 212.64 is: 293.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.40 : 438.22 = 212.64 : x
  2. Step 2: Convert to fraction form
    317.40/438.22 = 212.64/x
  3. Step 3: Cross multiply
    317.40x = 438.22 × 212.64
  4. Step 4: Simplify right side
    317.40x = 93,183.10
  5. Step 5: Solve for x
    x = 93,183.10/317.40
  6. Step 6: Final answer
    x = 293.58

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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.