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Finding the Fourth Proportional to 310.79, 428.79 and 200.07

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Solution

The fourth proportional to 310.79, 428.79 and 200.07 is: 276.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.79 : 428.79 = 200.07 : x
  2. Step 2: Convert to fraction form
    310.79/428.79 = 200.07/x
  3. Step 3: Cross multiply
    310.79x = 428.79 × 200.07
  4. Step 4: Simplify right side
    310.79x = 85,788.02
  5. Step 5: Solve for x
    x = 85,788.02/310.79
  6. Step 6: Final answer
    x = 276.03

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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.