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Finding the Fourth Proportional to 317.48, 438.20 and 212.68

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Solution

The fourth proportional to 317.48, 438.20 and 212.68 is: 293.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.48 : 438.20 = 212.68 : x
  2. Step 2: Convert to fraction form
    317.48/438.20 = 212.68/x
  3. Step 3: Cross multiply
    317.48x = 438.20 × 212.68
  4. Step 4: Simplify right side
    317.48x = 93,196.38
  5. Step 5: Solve for x
    x = 93,196.38/317.48
  6. Step 6: Final answer
    x = 293.55

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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.