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Finding the Fourth Proportional to 1,490.36, 2,234.22 and 515.78

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Solution

The fourth proportional to 1,490.36, 2,234.22 and 515.78 is: 773.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.36 : 2,234.22 = 515.78 : x
  2. Step 2: Convert to fraction form
    1,490.36/2,234.22 = 515.78/x
  3. Step 3: Cross multiply
    1,490.36x = 2,234.22 × 515.78
  4. Step 4: Simplify right side
    1,490.36x = 1,152,365.99
  5. Step 5: Solve for x
    x = 1,152,365.99/1,490.36
  6. Step 6: Final answer
    x = 773.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.