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Finding the Fourth Proportional to 939.98, 1,297.17 and 520.36

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Solution

The fourth proportional to 939.98, 1,297.17 and 520.36 is: 718.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.98 : 1,297.17 = 520.36 : x
  2. Step 2: Convert to fraction form
    939.98/1,297.17 = 520.36/x
  3. Step 3: Cross multiply
    939.98x = 1,297.17 × 520.36
  4. Step 4: Simplify right side
    939.98x = 674,992.14
  5. Step 5: Solve for x
    x = 674,992.14/939.98
  6. Step 6: Final answer
    x = 718.09

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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.