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Finding the Fourth Proportional to 937.89, 1,401.64 and 691.60

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Solution

The fourth proportional to 937.89, 1,401.64 and 691.60 is: 1,033.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.89 : 1,401.64 = 691.60 : x
  2. Step 2: Convert to fraction form
    937.89/1,401.64 = 691.60/x
  3. Step 3: Cross multiply
    937.89x = 1,401.64 × 691.60
  4. Step 4: Simplify right side
    937.89x = 969,372.04
  5. Step 5: Solve for x
    x = 969,372.04/937.89
  6. Step 6: Final answer
    x = 1,033.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.