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Finding the Fourth Proportional to 506.78, 699.27 and 320.31

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Solution

The fourth proportional to 506.78, 699.27 and 320.31 is: 441.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    506.78 : 699.27 = 320.31 : x
  2. Step 2: Convert to fraction form
    506.78/699.27 = 320.31/x
  3. Step 3: Cross multiply
    506.78x = 699.27 × 320.31
  4. Step 4: Simplify right side
    506.78x = 223,983.17
  5. Step 5: Solve for x
    x = 223,983.17/506.78
  6. Step 6: Final answer
    x = 441.98

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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.