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Finding the Fourth Proportional to 1,203.78, 1,805.49 and 999.66

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Solution

The fourth proportional to 1,203.78, 1,805.49 and 999.66 is: 1,499.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.78 : 1,805.49 = 999.66 : x
  2. Step 2: Convert to fraction form
    1,203.78/1,805.49 = 999.66/x
  3. Step 3: Cross multiply
    1,203.78x = 1,805.49 × 999.66
  4. Step 4: Simplify right side
    1,203.78x = 1,804,871.14
  5. Step 5: Solve for x
    x = 1,804,871.14/1,203.78
  6. Step 6: Final answer
    x = 1,499.34

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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.