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Finding the Fourth Proportional to 315.31, 435.20 and 211.75

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Solution

The fourth proportional to 315.31, 435.20 and 211.75 is: 292.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.31 : 435.20 = 211.75 : x
  2. Step 2: Convert to fraction form
    315.31/435.20 = 211.75/x
  3. Step 3: Cross multiply
    315.31x = 435.20 × 211.75
  4. Step 4: Simplify right side
    315.31x = 92,153.60
  5. Step 5: Solve for x
    x = 92,153.60/315.31
  6. Step 6: Final answer
    x = 292.26

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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.