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Finding the Fourth Proportional to 310.21, 428.09 and 170.33

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Solution

The fourth proportional to 310.21, 428.09 and 170.33 is: 235.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.21 : 428.09 = 170.33 : x
  2. Step 2: Convert to fraction form
    310.21/428.09 = 170.33/x
  3. Step 3: Cross multiply
    310.21x = 428.09 × 170.33
  4. Step 4: Simplify right side
    310.21x = 72,915.93
  5. Step 5: Solve for x
    x = 72,915.93/310.21
  6. Step 6: Final answer
    x = 235.05

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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.