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Finding the Fourth Proportional to 310.83, 428.45 and 251.90

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Solution

The fourth proportional to 310.83, 428.45 and 251.90 is: 347.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.83 : 428.45 = 251.90 : x
  2. Step 2: Convert to fraction form
    310.83/428.45 = 251.90/x
  3. Step 3: Cross multiply
    310.83x = 428.45 × 251.90
  4. Step 4: Simplify right side
    310.83x = 107,926.56
  5. Step 5: Solve for x
    x = 107,926.56/310.83
  6. Step 6: Final answer
    x = 347.23

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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.