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Finding the Fourth Proportional to 697.91, 1,046.81 and 287.03

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Solution

The fourth proportional to 697.91, 1,046.81 and 287.03 is: 430.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.91 : 1,046.81 = 287.03 : x
  2. Step 2: Convert to fraction form
    697.91/1,046.81 = 287.03/x
  3. Step 3: Cross multiply
    697.91x = 1,046.81 × 287.03
  4. Step 4: Simplify right side
    697.91x = 300,469.21
  5. Step 5: Solve for x
    x = 300,469.21/697.91
  6. Step 6: Final answer
    x = 430.53

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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.