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Finding the Fourth Proportional to 1,338.78, 2,008.78 and 517.24

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Solution

The fourth proportional to 1,338.78, 2,008.78 and 517.24 is: 776.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.78 : 2,008.78 = 517.24 : x
  2. Step 2: Convert to fraction form
    1,338.78/2,008.78 = 517.24/x
  3. Step 3: Cross multiply
    1,338.78x = 2,008.78 × 517.24
  4. Step 4: Simplify right side
    1,338.78x = 1,039,021.37
  5. Step 5: Solve for x
    x = 1,039,021.37/1,338.78
  6. Step 6: Final answer
    x = 776.10

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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.