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Finding the Fourth Proportional to 685.18, 1,027.90 and 356.27

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Solution

The fourth proportional to 685.18, 1,027.90 and 356.27 is: 534.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.18 : 1,027.90 = 356.27 : x
  2. Step 2: Convert to fraction form
    685.18/1,027.90 = 356.27/x
  3. Step 3: Cross multiply
    685.18x = 1,027.90 × 356.27
  4. Step 4: Simplify right side
    685.18x = 366,212.91
  5. Step 5: Solve for x
    x = 366,212.91/685.18
  6. Step 6: Final answer
    x = 534.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.