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Finding the Fourth Proportional to 310.79, 428.74 and 192.74

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Solution

The fourth proportional to 310.79, 428.74 and 192.74 is: 265.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.79 : 428.74 = 192.74 : x
  2. Step 2: Convert to fraction form
    310.79/428.74 = 192.74/x
  3. Step 3: Cross multiply
    310.79x = 428.74 × 192.74
  4. Step 4: Simplify right side
    310.79x = 82,632.72
  5. Step 5: Solve for x
    x = 82,632.72/310.79
  6. Step 6: Final answer
    x = 265.88

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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.