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Finding the Fourth Proportional to 310.12, 428.04 and 193.64

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Solution

The fourth proportional to 310.12, 428.04 and 193.64 is: 267.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.12 : 428.04 = 193.64 : x
  2. Step 2: Convert to fraction form
    310.12/428.04 = 193.64/x
  3. Step 3: Cross multiply
    310.12x = 428.04 × 193.64
  4. Step 4: Simplify right side
    310.12x = 82,885.67
  5. Step 5: Solve for x
    x = 82,885.67/310.12
  6. Step 6: Final answer
    x = 267.27

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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.