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Finding the Fourth Proportional to 1,259.88, 1,889.07 and 519.27

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Solution

The fourth proportional to 1,259.88, 1,889.07 and 519.27 is: 778.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.88 : 1,889.07 = 519.27 : x
  2. Step 2: Convert to fraction form
    1,259.88/1,889.07 = 519.27/x
  3. Step 3: Cross multiply
    1,259.88x = 1,889.07 × 519.27
  4. Step 4: Simplify right side
    1,259.88x = 980,937.38
  5. Step 5: Solve for x
    x = 980,937.38/1,259.88
  6. Step 6: Final answer
    x = 778.60

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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.