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Finding the Fourth Proportional to 1,243.78, 1,866.08 and 550.63

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Solution

The fourth proportional to 1,243.78, 1,866.08 and 550.63 is: 826.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.78 : 1,866.08 = 550.63 : x
  2. Step 2: Convert to fraction form
    1,243.78/1,866.08 = 550.63/x
  3. Step 3: Cross multiply
    1,243.78x = 1,866.08 × 550.63
  4. Step 4: Simplify right side
    1,243.78x = 1,027,507.55
  5. Step 5: Solve for x
    x = 1,027,507.55/1,243.78
  6. Step 6: Final answer
    x = 826.12

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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.