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Finding the Fourth Proportional to 938.15, 1,294.61 and 518.49

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Solution

The fourth proportional to 938.15, 1,294.61 and 518.49 is: 715.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.15 : 1,294.61 = 518.49 : x
  2. Step 2: Convert to fraction form
    938.15/1,294.61 = 518.49/x
  3. Step 3: Cross multiply
    938.15x = 1,294.61 × 518.49
  4. Step 4: Simplify right side
    938.15x = 671,239.75
  5. Step 5: Solve for x
    x = 671,239.75/938.15
  6. Step 6: Final answer
    x = 715.50

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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.