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Finding the Fourth Proportional to 310.12, 428.22 and 309.52

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Solution

The fourth proportional to 310.12, 428.22 and 309.52 is: 427.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.12 : 428.22 = 309.52 : x
  2. Step 2: Convert to fraction form
    310.12/428.22 = 309.52/x
  3. Step 3: Cross multiply
    310.12x = 428.22 × 309.52
  4. Step 4: Simplify right side
    310.12x = 132,542.65
  5. Step 5: Solve for x
    x = 132,542.65/310.12
  6. Step 6: Final answer
    x = 427.39

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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.