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Finding the Fourth Proportional to 310.86, 428.31 and 207.18

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Solution

The fourth proportional to 310.86, 428.31 and 207.18 is: 285.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.86 : 428.31 = 207.18 : x
  2. Step 2: Convert to fraction form
    310.86/428.31 = 207.18/x
  3. Step 3: Cross multiply
    310.86x = 428.31 × 207.18
  4. Step 4: Simplify right side
    310.86x = 88,737.27
  5. Step 5: Solve for x
    x = 88,737.27/310.86
  6. Step 6: Final answer
    x = 285.46

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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.