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Finding the Fourth Proportional to 927.38, 1,279.78 and 513.38

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Solution

The fourth proportional to 927.38, 1,279.78 and 513.38 is: 708.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.38 : 1,279.78 = 513.38 : x
  2. Step 2: Convert to fraction form
    927.38/1,279.78 = 513.38/x
  3. Step 3: Cross multiply
    927.38x = 1,279.78 × 513.38
  4. Step 4: Simplify right side
    927.38x = 657,005.77
  5. Step 5: Solve for x
    x = 657,005.77/927.38
  6. Step 6: Final answer
    x = 708.46

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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.