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Finding the Fourth Proportional to 917.98, 1,375.62 and 685.78

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Solution

The fourth proportional to 917.98, 1,375.62 and 685.78 is: 1,027.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.98 : 1,375.62 = 685.78 : x
  2. Step 2: Convert to fraction form
    917.98/1,375.62 = 685.78/x
  3. Step 3: Cross multiply
    917.98x = 1,375.62 × 685.78
  4. Step 4: Simplify right side
    917.98x = 943,372.68
  5. Step 5: Solve for x
    x = 943,372.68/917.98
  6. Step 6: Final answer
    x = 1,027.66

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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.