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Finding the Fourth Proportional to 939.92, 1,297.04 and 520.28

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Solution

The fourth proportional to 939.92, 1,297.04 and 520.28 is: 717.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.92 : 1,297.04 = 520.28 : x
  2. Step 2: Convert to fraction form
    939.92/1,297.04 = 520.28/x
  3. Step 3: Cross multiply
    939.92x = 1,297.04 × 520.28
  4. Step 4: Simplify right side
    939.92x = 674,814.88
  5. Step 5: Solve for x
    x = 674,814.88/939.92
  6. Step 6: Final answer
    x = 717.95

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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.