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Finding the Fourth Proportional to 1,039.78, 1,558.86 and 519.53

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Solution

The fourth proportional to 1,039.78, 1,558.86 and 519.53 is: 778.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.78 : 1,558.86 = 519.53 : x
  2. Step 2: Convert to fraction form
    1,039.78/1,558.86 = 519.53/x
  3. Step 3: Cross multiply
    1,039.78x = 1,558.86 × 519.53
  4. Step 4: Simplify right side
    1,039.78x = 809,864.79
  5. Step 5: Solve for x
    x = 809,864.79/1,039.78
  6. Step 6: Final answer
    x = 778.88

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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.