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Finding the Fourth Proportional to 939.86, 1,297.09 and 546.91

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Solution

The fourth proportional to 939.86, 1,297.09 and 546.91 is: 754.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.86 : 1,297.09 = 546.91 : x
  2. Step 2: Convert to fraction form
    939.86/1,297.09 = 546.91/x
  3. Step 3: Cross multiply
    939.86x = 1,297.09 × 546.91
  4. Step 4: Simplify right side
    939.86x = 709,391.49
  5. Step 5: Solve for x
    x = 709,391.49/939.86
  6. Step 6: Final answer
    x = 754.78

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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.