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Finding the Fourth Proportional to 749.68, 1,033.86 and 667.60

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Solution

The fourth proportional to 749.68, 1,033.86 and 667.60 is: 920.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.68 : 1,033.86 = 667.60 : x
  2. Step 2: Convert to fraction form
    749.68/1,033.86 = 667.60/x
  3. Step 3: Cross multiply
    749.68x = 1,033.86 × 667.60
  4. Step 4: Simplify right side
    749.68x = 690,204.94
  5. Step 5: Solve for x
    x = 690,204.94/749.68
  6. Step 6: Final answer
    x = 920.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.