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Finding the Fourth Proportional to 685.28, 1,026.30 and 540.56

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Solution

The fourth proportional to 685.28, 1,026.30 and 540.56 is: 809.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.28 : 1,026.30 = 540.56 : x
  2. Step 2: Convert to fraction form
    685.28/1,026.30 = 540.56/x
  3. Step 3: Cross multiply
    685.28x = 1,026.30 × 540.56
  4. Step 4: Simplify right side
    685.28x = 554,776.73
  5. Step 5: Solve for x
    x = 554,776.73/685.28
  6. Step 6: Final answer
    x = 809.56

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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.