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Finding the Fourth Proportional to 939.19, 1,296.05 and 513.81

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Solution

The fourth proportional to 939.19, 1,296.05 and 513.81 is: 709.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.19 : 1,296.05 = 513.81 : x
  2. Step 2: Convert to fraction form
    939.19/1,296.05 = 513.81/x
  3. Step 3: Cross multiply
    939.19x = 1,296.05 × 513.81
  4. Step 4: Simplify right side
    939.19x = 665,924.27
  5. Step 5: Solve for x
    x = 665,924.27/939.19
  6. Step 6: Final answer
    x = 709.04

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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.