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Finding the Fourth Proportional to 506.11, 698.70 and 319.90

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Solution

The fourth proportional to 506.11, 698.70 and 319.90 is: 441.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    506.11 : 698.70 = 319.90 : x
  2. Step 2: Convert to fraction form
    506.11/698.70 = 319.90/x
  3. Step 3: Cross multiply
    506.11x = 698.70 × 319.90
  4. Step 4: Simplify right side
    506.11x = 223,514.13
  5. Step 5: Solve for x
    x = 223,514.13/506.11
  6. Step 6: Final answer
    x = 441.63

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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.