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Finding the Fourth Proportional to 685.68, 1,027.98 and 356.47

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Solution

The fourth proportional to 685.68, 1,027.98 and 356.47 is: 534.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.68 : 1,027.98 = 356.47 : x
  2. Step 2: Convert to fraction form
    685.68/1,027.98 = 356.47/x
  3. Step 3: Cross multiply
    685.68x = 1,027.98 × 356.47
  4. Step 4: Simplify right side
    685.68x = 366,441.46
  5. Step 5: Solve for x
    x = 366,441.46/685.68
  6. Step 6: Final answer
    x = 534.42

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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.