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Finding the Fourth Proportional to 738.45, 1,105.53 and 518.79

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Solution

The fourth proportional to 738.45, 1,105.53 and 518.79 is: 776.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.45 : 1,105.53 = 518.79 : x
  2. Step 2: Convert to fraction form
    738.45/1,105.53 = 518.79/x
  3. Step 3: Cross multiply
    738.45x = 1,105.53 × 518.79
  4. Step 4: Simplify right side
    738.45x = 573,537.91
  5. Step 5: Solve for x
    x = 573,537.91/738.45
  6. Step 6: Final answer
    x = 776.68

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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.