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Finding the Fourth Proportional to 310.59, 428.74 and 192.59

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Solution

The fourth proportional to 310.59, 428.74 and 192.59 is: 265.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.59 : 428.74 = 192.59 : x
  2. Step 2: Convert to fraction form
    310.59/428.74 = 192.59/x
  3. Step 3: Cross multiply
    310.59x = 428.74 × 192.59
  4. Step 4: Simplify right side
    310.59x = 82,570.02
  5. Step 5: Solve for x
    x = 82,570.02/310.59
  6. Step 6: Final answer
    x = 265.85

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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.