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Finding the Fourth Proportional to 938.21, 1,294.81 and 518.65

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Solution

The fourth proportional to 938.21, 1,294.81 and 518.65 is: 715.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.21 : 1,294.81 = 518.65 : x
  2. Step 2: Convert to fraction form
    938.21/1,294.81 = 518.65/x
  3. Step 3: Cross multiply
    938.21x = 1,294.81 × 518.65
  4. Step 4: Simplify right side
    938.21x = 671,553.21
  5. Step 5: Solve for x
    x = 671,553.21/938.21
  6. Step 6: Final answer
    x = 715.79

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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.