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Finding the Fourth Proportional to 905.24, 1,356.60 and 519.68

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Solution

The fourth proportional to 905.24, 1,356.60 and 519.68 is: 778.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.24 : 1,356.60 = 519.68 : x
  2. Step 2: Convert to fraction form
    905.24/1,356.60 = 519.68/x
  3. Step 3: Cross multiply
    905.24x = 1,356.60 × 519.68
  4. Step 4: Simplify right side
    905.24x = 704,997.89
  5. Step 5: Solve for x
    x = 704,997.89/905.24
  6. Step 6: Final answer
    x = 778.80

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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.