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Finding the Fourth Proportional to 908.44, 1,359.60 and 690.76

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Solution

The fourth proportional to 908.44, 1,359.60 and 690.76 is: 1,033.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.44 : 1,359.60 = 690.76 : x
  2. Step 2: Convert to fraction form
    908.44/1,359.60 = 690.76/x
  3. Step 3: Cross multiply
    908.44x = 1,359.60 × 690.76
  4. Step 4: Simplify right side
    908.44x = 939,157.30
  5. Step 5: Solve for x
    x = 939,157.30/908.44
  6. Step 6: Final answer
    x = 1,033.81

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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.