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Finding the Fourth Proportional to 939.75, 1,293.21 and 717.81

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Solution

The fourth proportional to 939.75, 1,293.21 and 717.81 is: 987.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.75 : 1,293.21 = 717.81 : x
  2. Step 2: Convert to fraction form
    939.75/1,293.21 = 717.81/x
  3. Step 3: Cross multiply
    939.75x = 1,293.21 × 717.81
  4. Step 4: Simplify right side
    939.75x = 928,279.07
  5. Step 5: Solve for x
    x = 928,279.07/939.75
  6. Step 6: Final answer
    x = 987.79

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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.