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Finding the Fourth Proportional to 1,203.78, 1,806.39 and 519.78

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Solution

The fourth proportional to 1,203.78, 1,806.39 and 519.78 is: 779.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.78 : 1,806.39 = 519.78 : x
  2. Step 2: Convert to fraction form
    1,203.78/1,806.39 = 519.78/x
  3. Step 3: Cross multiply
    1,203.78x = 1,806.39 × 519.78
  4. Step 4: Simplify right side
    1,203.78x = 938,925.39
  5. Step 5: Solve for x
    x = 938,925.39/1,203.78
  6. Step 6: Final answer
    x = 779.98

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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.