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Finding the Fourth Proportional to 1,790.78, 2,686.42 and 636.26

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Solution

The fourth proportional to 1,790.78, 2,686.42 and 636.26 is: 954.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,790.78 : 2,686.42 = 636.26 : x
  2. Step 2: Convert to fraction form
    1,790.78/2,686.42 = 636.26/x
  3. Step 3: Cross multiply
    1,790.78x = 2,686.42 × 636.26
  4. Step 4: Simplify right side
    1,790.78x = 1,709,261.59
  5. Step 5: Solve for x
    x = 1,709,261.59/1,790.78
  6. Step 6: Final answer
    x = 954.48

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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.