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Finding the Fourth Proportional to 310.55, 428.63 and 243.12

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Solution

The fourth proportional to 310.55, 428.63 and 243.12 is: 335.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.55 : 428.63 = 243.12 : x
  2. Step 2: Convert to fraction form
    310.55/428.63 = 243.12/x
  3. Step 3: Cross multiply
    310.55x = 428.63 × 243.12
  4. Step 4: Simplify right side
    310.55x = 104,207.31
  5. Step 5: Solve for x
    x = 104,207.31/310.55
  6. Step 6: Final answer
    x = 335.56

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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.