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Finding the Fourth Proportional to 691.20, 1,035.89 and 325.49

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Solution

The fourth proportional to 691.20, 1,035.89 and 325.49 is: 487.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.20 : 1,035.89 = 325.49 : x
  2. Step 2: Convert to fraction form
    691.20/1,035.89 = 325.49/x
  3. Step 3: Cross multiply
    691.20x = 1,035.89 × 325.49
  4. Step 4: Simplify right side
    691.20x = 337,171.84
  5. Step 5: Solve for x
    x = 337,171.84/691.20
  6. Step 6: Final answer
    x = 487.81

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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.